Nocturnal Seizures
Recognition, risks and staying safer when seizures happen during sleep
Epileptic seizures can happen:
while awake
while asleep
around the transition into sleep
or shortly after waking.
Some people have seizures almost entirely during sleep.
Others experience both daytime and night-time seizures.
The terms nocturnal seizures, sleep seizures and sleep-related seizures are commonly used to describe seizures that occur during sleep.
Night-time seizures deserve attention even when they do not interfere directly with someone's daytime activities.
They can:
disrupt sleep
cause injuries
go unrecognised
contribute to daytime tiredness
be difficult to count accurately
and, particularly when tonic-clonic seizures remain uncontrolled, contribute to epilepsy-related safety risks.
The International League Against Epilepsy — ILAE — identifies achieving the best possible seizure control, especially control of tonic-clonic seizures, as the most important known way to reduce the risk of sudden unexpected death in epilepsy — SUDEP.
Sleep seizures are not one particular seizure type
A seizure occurring during sleep might be:
focal
focal impaired consciousness
focal to bilateral tonic-clonic
generalised tonic-clonic
tonic
myoclonic
or another seizure type.
The word nocturnal tells us when the seizure happened.
It does not tell us what kind of seizure it was.
Some epilepsy syndromes have especially strong relationships with sleep, but many different epilepsies can produce sleep-related seizures.
Night-time seizures may be missed
One of the difficulties with sleep seizures is simple:
the person is asleep.
They may have no memory of the event.
Anyone else in the home may also be asleep.
The seizure might therefore be:
completely unnoticed
recognised only indirectly
or discovered later through a camera, monitor or formal EEG recording.
This means a person's reported seizure count may underestimate their actual night-time seizure burden.
Possible signs that a sleep seizure has occurred
Possible clues include:
somebody witnessing a seizure
waking unusually confused
waking somewhere unexpected
unexplained injuries
unexplained bruising
tongue or mouth injury
disturbed bedding
items knocked from a bedside surface
an unexplained period of incontinence
unusual muscle soreness
a recorded event on a camera or monitoring device
or a pattern of unusual night-time movements witnessed by another person.
Epilepsy organisations internationally stress that these signs are clues rather than proof. Many have other explanations.
For example:
waking tired does not by itself prove that a seizure occurred.
Sleep contains many movements that are not seizures
People normally:
turn over
twitch
move their legs
talk
briefly sit up
dream
and partially wake during sleep.
Other sleep disorders can cause much more dramatic behaviour.
These include:
sleepwalking
night terrors
REM sleep behaviour disorder
periodic limb movements
sleep apnoea
and other parasomnias.
So somebody should not assume:
“It happened during sleep, therefore it was epilepsy.”
Related Information Hub page:
Sleep Studies, Parasomnias and Nocturnal Events
Why can sleep influence seizures?
Sleep changes how brain networks communicate.
Different sleep stages alter:
neuronal synchronisation
cortical excitability
electrical rhythms
and the likelihood that epileptiform activity will become visible.
For some people, seizures are much more likely during particular sleep states or around waking.
Sleep deprivation and irregular sleep can also increase seizure susceptibility in some people.
The World Health Organization specifically recognises sleep deprivation and disruption of circadian rhythms as factors that can provoke seizures in people with epilepsy.
Sleep loss is not the underlying cause of most epilepsy
This distinction matters.
A poor night's sleep may increase the likelihood of a seizure in somebody who already has an epileptic predisposition.
That does not mean:
lack of sleep caused their epilepsy.
Trigger and cause are different concepts.
Related Information Hub page:
Seizure Triggers vs Seizure Causes — What's the Difference?
Seizures can also damage sleep quality
The relationship goes both ways.
Night-time seizures may cause:
repeated awakenings
fragmented sleep
altered sleep architecture
postictal wakefulness
or prolonged recovery sleep.
Someone can therefore spend many hours in bed and still wake feeling poorly rested.
Epilepsy and sleep disorders such as obstructive sleep apnoea can also coexist.
Why are tonic-clonic seizures during sleep particularly important?
Tonic-clonic seizures can involve:
loss of consciousness
stiffening
rhythmic jerking
changes in breathing
and prolonged postictal unresponsiveness.
During the day, another person may be more likely to notice and help.
At night, a seizure may happen unnoticed.
This matters particularly when tonic-clonic seizures remain uncontrolled because frequent tonic-clonic seizures are the strongest established clinical risk factor for SUDEP.
What is SUDEP?
SUDEP — sudden unexpected death in epilepsy — is when a person with epilepsy dies suddenly and unexpectedly and no other cause adequately explains the death after appropriate investigation.
It is uncommon, but it is an important epilepsy-related risk.
SUDEP often occurs:
during the night
during sleep
or in circumstances where a person is found in or near bed.
The majority of observed SUDEP cases appear to follow a convulsive seizure.
Night-time seizures do not mean SUDEP is inevitable
Absolutely not.
Most people who have seizures during sleep do not die from SUDEP.
Individual risk varies greatly.
The strongest modifiable issue is seizure control, particularly reducing or eliminating tonic-clonic seizures.
The ILAE therefore identifies optimisation of seizure control as the most important current risk-reduction measure.
Why does SUDEP often happen at night?
The mechanism is not completely understood.
Research suggests several factors may contribute.
These include:
tonic-clonic seizures being unwitnessed
postictal breathing disturbance
impaired arousal after a seizure
autonomic and cardiac changes
sleep-related changes in breathing
and body position.
Many people who have died from SUDEP have been found in a prone — face-down — position.
However, this does not mean body position alone explains SUDEP.
Current research supports a complex interaction involving:
seizure activity
breathing
arousal
cardiovascular function
sleep state
and individual vulnerability.
Breathing may change during and after seizures
Some seizures can affect the brain networks involved in breathing.
Changes may include:
altered respiratory rhythm
temporary apnoea
noisy breathing
reduced oxygen levels
or impaired recovery of normal breathing after the seizure.
These changes are one area of intensive SUDEP research.
They do not mean every unusual breath or snore during a seizure is life-threatening.
But prolonged failure of breathing to return to normal is an emergency.
Planned related Information Hub page:
Breathing Changes During Seizures
What should someone do if they witness a night-time tonic-clonic seizure?
Follow ordinary seizure first aid.
Priorities include:
protect the person from immediate injury
time the seizure
do not restrain them
do not put anything into their mouth
move dangerous objects away
follow their individual seizure emergency plan
and monitor breathing and recovery.
Once convulsive movement has stopped, positioning the person safely on their side may help keep the airway clear when appropriate and feasible.
First-aid recommendations vary slightly between countries, so local emergency guidance and the person's individual care plan should be followed.
When should emergency services be contacted?
Emergency numbers vary internationally.
Use the emergency medical number for the country you are in.
Urgent medical help is generally appropriate when:
a convulsive seizure lasts 5 minutes or longer
another convulsive seizure begins before the person recovers
the person's prescribed rescue treatment fails
breathing does not recover adequately
there is serious injury
the seizure occurs in water
it is a first recognised seizure
or the person's individual emergency plan says emergency services are required.
The ILAE operational threshold for convulsive status epilepticus is 5 minutes.
Related Information Hub page:
Status Epilepticus: When a Seizure Becomes a Medical Emergency
An emergency plan should work at night too
Someone with significant night-time seizures may benefit from a written plan explaining:
what their usual seizures look like
how long they normally last
when rescue medicine is required
what recovery usually looks like
when another person should intervene
and when emergency medical help is needed.
The plan should be understandable to:
partners
parents
relatives
carers
support workers
or anyone who may be present overnight.
The safest bedroom setup is individual
There is no single “epilepsy bedroom” that everybody should copy.
Safety measures should depend on:
seizure type
mobility
falls
nocturnal wandering
convulsive movements
age
independence
and personal preferences.
The goal should be to reduce genuine hazards without unnecessarily removing someone's privacy or independence.
Keep dangerous objects away from the bed
A person who convulses or moves violently during seizures may strike nearby objects.
Depending on the individual situation, useful changes can include moving:
sharp-edged furniture
glass objects
heavy lamps
heaters
exposed cables
or other objects likely to cause injury.
Both the Epilepsy Foundation and Epilepsy Society recommend reducing obvious hazards around the sleeping area for people at risk of seizures during sleep.
A lower bed can reduce fall injuries
If seizures repeatedly cause someone to fall from bed, options may include:
a lower bed
a suitable mattress closer to floor level
or safer flooring around the bed.
This reduces the distance of a possible fall.
It is not necessary for every person with nocturnal epilepsy.
The decision should depend on actual fall risk.
Bed rails are not automatically safer
It may seem obvious to put rails around a bed.
But rails can create risks of:
trapping a limb
becoming wedged between rail and mattress
striking the rail during a convulsion
or entrapment.
They therefore require an individual risk assessment rather than being recommended automatically.
Different countries also regulate medical bed rails differently.
What about padding?
Softening a genuine impact hazard may sometimes help.
But improvised padding can also:
trap the person
restrict movement
obstruct breathing
or create additional entrapment hazards.
Any substantial bed modification should therefore be considered carefully.
What about pillows?
There is no good evidence that a specialist anti-suffocation pillow prevents SUDEP.
The Epilepsy Foundation specifically states that evidence does not establish these pillows as a way of preventing SUDEP.
Products should therefore not be marketed or treated as guaranteed protection.
More bedding is not necessarily safer
Piling cushions, pillows or soft barriers around somebody can create new problems.
Anything near the face has the potential to affect:
airflow
repositioning
or the ability of another person to assist.
The safest sleep environment should be based on the individual's seizure pattern rather than attempting to surround them with excessive padding.
Should people with epilepsy avoid sleeping face down?
Prone positioning has repeatedly been observed in SUDEP cases.
Because of this association, some epilepsy organisations advise people with uncontrolled convulsive sleep seizures to discuss sleeping position with their healthcare team.
However:
simply avoiding the prone position has not been proven to eliminate SUDEP risk.
People also naturally change position during sleep.
The central preventive priority remains improving seizure control, especially control of tonic-clonic seizures.
Should somebody share a bedroom?
Not automatically.
Night-time supervision has been associated with lower SUDEP risk in some observational evidence.
The American Academy of Neurology/American Epilepsy Society guideline states that, for selected people with frequent tonic-clonic and nocturnal seizures, clinicians may discuss:
nocturnal supervision
or precautions such as remote listening.
It also recognises that constant supervision can be:
intrusive
burdensome
disruptive to sleep
and incompatible with some people's independence and preferences.
WHO also addresses nocturnal supervision
The World Health Organization currently recommends that nocturnal supervision be considered as a possible SUDEP-prevention measure.
Importantly, WHO classifies this as a:
conditional recommendation based on very low-certainty evidence.
That qualification matters.
It means there is some evidence supporting discussion of supervision, but not enough to say every person with nocturnal epilepsy must sleep beside another person.
Independence and safety have to be balanced
A person with epilepsy should not automatically be told:
“You can never sleep alone again.”
The decision should consider:
seizure type
tonic-clonic seizure frequency
whether seizures are controlled
previous emergencies
individual SUDEP risk
living arrangements
privacy
emotional wellbeing
finances
and what safety measures are realistically sustainable.
Different people may reasonably make different choices.
What is nocturnal supervision?
It can mean different things.
Examples include:
another person sleeping in the same room
somebody sleeping nearby
a listening monitor
video monitoring
a seizure alarm
or another system designed to alert a responder.
These options are not equivalent.
The important question is:
What event are we trying to detect, and what will somebody actually do when alerted?
A monitor is useful only if there is a response plan
An alarm by itself does not provide first aid.
Before using monitoring equipment, consider:
who receives the alert
whether they can wake reliably
how quickly they can reach the person
what they should check
what first aid they know
whether rescue medication is prescribed
and when emergency services should be called.
A detection system without a practical response plan may provide less protection than people assume.
Seizure alarms cannot detect every seizure
This is one of the most important limitations.
Different devices may monitor:
movement
muscle activity
heart rate
skin conductance
sound
pressure
or combinations of physiological signals.
A device designed to recognise repeated convulsive movement may perform reasonably well for tonic-clonic seizures.
It may completely miss:
focal sensory seizures
auras
staring
subtle automatisms
brief impaired-consciousness seizures
or seizures with very little movement.
The ILAE and International Federation of Clinical Neurophysiology recommend wearable automated seizure-detection devices as a clinical adjunct for selected people when detection of tonic-clonic seizures is important, while recognising that evidence for other seizure types is substantially weaker.
Current research shows that tonic-clonic detection is much better than focal seizure detection
A 2026 systematic review and meta-analysis examined wearable seizure-detection studies using video EEG as the reference standard.
Across studies of tonic-clonic seizures, pooled sensitivity was approximately 90%.
However, devices also produced false alarms.
Detection of focal seizures was substantially less reliable.
Those figures describe pooled research results.
They do not mean a particular consumer device will detect 90% of one person's seizures at home.
False alarms matter
A device that alarms unnecessarily can cause:
repeated night-time waking
anxiety
caregiver exhaustion
loss of confidence in the device
or eventual abandonment of monitoring.
A technically impressive detector may therefore still be impractical if false alarms are frequent.
A 2024 systematic review of community wearable use found that real-world performance and user experience remain important limitations beyond laboratory accuracy.
No seizure alarm has been proven to prevent SUDEP
This should be stated clearly.
Devices may:
detect some seizures
notify another person
allow faster assistance.
But current evidence does not prove that a particular commercial seizure detector prevents SUDEP.
The Epilepsy Foundation and ILAE both emphasise this uncertainty.
So the appropriate claim is:
a device may form part of an individual safety plan.
Not:
a device makes night-time epilepsy safe.
A monitor may still be useful
Lack of proof of SUDEP prevention does not make monitoring pointless.
For some people it may help:
alert a carer to tonic-clonic seizures
identify previously unnoticed night-time events
document seizure frequency
reduce delays in providing first aid
or provide reassurance.
The potential value depends on what seizures the device can actually detect.
Cameras have strengths and limitations
A night camera may record:
movement
body position
duration
vocalisation
and post-event behaviour.
This can be useful when:
seizures are uncertain
seizure frequency is unclear
or a neurologist wants to see a typical event.
But video cannot directly show electrical seizure activity in the brain.
Normal sleep movements can also look alarming on camera.
Related Information Hub page:
Seizure Diaries and Videos: How to Record Useful Evidence
Audio monitors can sometimes help
A listening monitor may detect:
vocalisation
bed movement
repeated sounds
or other unusual activity.
This can allow another person to check what is happening.
But quiet seizures may produce no useful sound.
An audio monitor therefore cannot be assumed to monitor all epilepsy.
Wearable devices are improving
Modern systems can combine signals such as:
accelerometry
electrodermal activity
heart rate
photoplethysmography
electromyography
and other measurements.
Recent research continues to improve automated tonic-clonic detection.
But focal and non-motor seizures remain much more difficult to identify reliably outside EEG monitoring.
Detection is not the same as prediction
A device detecting a seizure that has already started is performing seizure detection.
Predicting a seizure before it begins is a much harder problem.
Commercial claims should therefore be read carefully.
A device that alerts after strong repetitive movement begins is not necessarily predicting seizures in advance.
Medical devices differ between countries
Device:
regulation
approval
prescribing
reimbursement
insurance coverage
and availability
vary internationally.
A device authorised as a medical product in one country may not have the same status somewhere else.
The Information Hub should therefore avoid presenting any particular commercial product as universally approved or recommended.
What about smartwatches?
Some smartwatches and smartphone systems can:
detect falls
measure pulse
recognise unusual movement
or send an emergency alert.
These functions may occasionally be helpful.
But a general consumer smartwatch should not automatically be assumed to be a validated seizure-detection device.
Check:
what it actually detects
whether it has clinical validation
what seizure type was studied
false-alarm performance
and the regulatory status in your country.
Medication remains more important than monitoring technology
A monitor can notify somebody that a seizure occurred.
It does not treat the underlying epilepsy.
The ILAE emphasises that optimising seizure control — especially reducing tonic-clonic seizures — remains the most important known SUDEP risk-reduction measure.
This can involve:
taking antiseizure medication consistently
reviewing persistent seizures
revisiting the diagnosis where necessary
considering different medication
and, for suitable people, considering surgery, dietary therapy or neuromodulation.
Do not accept persistent night-time seizures simply because they are less disruptive
A night-time seizure may not interrupt:
work
school
conversations
or ordinary daytime activities.
That can make it seem less important.
But ongoing sleep seizures still represent uncontrolled epilepsy.
They can affect:
injury risk
sleep quality
daytime cognition
medication decisions
and SUDEP risk, particularly when tonic-clonic seizures occur.
The epilepsy team should know they are happening.
Could medication timing be adjusted?
Sometimes clinicians alter:
dose
timing
or distribution of antiseizure medication
when seizures have a strong sleep-related pattern.
This must be done by the prescribing clinician.
Nobody should move most of their medicine to bedtime or change doses independently because they have read that their seizures occur at night.
Missing night-time medication matters
Consistency with prescribed antiseizure medication is an important part of seizure control.
The ILAE specifically includes adherence to epilepsy medication among SUDEP risk-reduction measures.
If remembering an evening dose is difficult, options might include:
alarms
pill organisers
medication apps
or linking medicine to a regular routine.
Medication systems should be chosen in ways that minimise accidental double dosing.
What if someone vomits after medication?
Vomiting may affect how much medication has been absorbed.
There is no single worldwide rule for automatically repeating a dose because:
medicines differ
formulations differ
and time since dosing matters.
The safest approach is to have medicine-specific guidance from:
the prescribing clinician
epilepsy service
or pharmacist.
Repeated vomiting with uncontrolled seizures may require urgent medical assessment.
Sleep routine can matter
For some people, inconsistent or insufficient sleep makes seizures more likely.
Helpful general measures may include:
trying to maintain adequate sleep
addressing persistent insomnia
avoiding repeated deliberate sleep deprivation
and obtaining assessment for possible sleep disorders.
These measures should support epilepsy treatment rather than being presented as a cure.
Sleep apnoea deserves attention
Obstructive sleep apnoea can cause:
repeated airway obstruction
reduced oxygen
snoring
gasping
fragmented sleep
and excessive daytime tiredness.
It can coexist with epilepsy.
Research into SUDEP also continues to examine the relationship between epilepsy, sleep-disordered breathing and seizure-related respiratory dysfunction.
Someone with:
loud habitual snoring
witnessed breathing pauses
gasping during ordinary sleep
and significant daytime sleepiness
may benefit from assessment for sleep apnoea rather than assuming every breathing disturbance is epileptic.
Alcohol and recreational drugs can increase risk in some people
Alcohol can affect epilepsy through:
sleep disruption
missed medication
intoxication
withdrawal
dehydration
and interactions.
Recreational drugs can also affect seizure risk unpredictably.
The ILAE includes avoiding excessive alcohol and other drugs among sensible measures that may support seizure control and reduce overall risk.
Bedroom temperature and ordinary comfort still matter
Safety planning should not make sleep impossible.
A person who becomes:
excessively hot
uncomfortable
anxious
or repeatedly awakened by equipment
may sleep worse.
For someone whose seizures are sensitive to sleep deprivation, an overly complicated safety system may have unintended disadvantages.
The aim is proportionate risk reduction, not maximum possible surveillance.
Children and nocturnal seizures
Children can also experience sleep seizures.
Safety planning should reflect:
the child's seizure type
age
developmental ability
mobility
bed design
rescue plan
and family circumstances.
Parents may understandably want continuous monitoring.
But monitoring systems still have limitations, and a child's epilepsy team can help decide what level of night-time observation is appropriate.
Teenagers need growing privacy too
As children become teenagers, constant parental monitoring can become:
intrusive
stressful
and incompatible with developing independence.
Risk planning may need to evolve gradually.
Possible alternatives can include:
alarms
listening devices
agreed response plans
or another arrangement acceptable to the young person and family.
There is rarely one solution appropriate for every age.
Adults living alone
Living alone can create particular concerns when a person has:
frequent uncontrolled tonic-clonic seizures
prolonged seizures
or significant postictal impairment.
Possible planning might include:
seizure-detection technology
emergency alert systems
scheduled contact
trusted contacts nearby
an accessible emergency plan
or changes to the sleeping environment.
Not every adult with epilepsy who lives alone needs continuous surveillance.
The level of intervention should reflect individual risk.
Night-time supervision is not a substitute for treatment review
If someone needs increasingly intensive supervision because seizures remain uncontrolled, the question should also be:
Can seizure control itself be improved?
The clinical team may need to consider:
medication optimisation
diagnostic re-evaluation
video EEG
tertiary epilepsy referral
epilepsy surgery assessment
neuromodulation
dietary treatment
or another intervention.
Monitoring treats the consequences of seizure unpredictability.
It does not remove the seizure-generating condition.
Injury prevention
Possible night-time seizure injuries include:
falling from bed
striking nearby furniture
shoulder injuries
bruising
tongue injury
head injury
or injuries sustained while wandering after a seizure.
A safety review should focus on injuries the person has actually experienced or is realistically at risk of experiencing, rather than attempting to eliminate every theoretical danger.
What about nocturnal wandering?
Some focal seizures can involve:
getting out of bed
walking
automatisms
or postictal wandering.
Parasomnias can do this too.
If somebody is leaving:
the bedroom
the house
or entering dangerous areas
during unexplained night-time episodes, the first priority is establishing what the events actually are.
Safety measures around:
stairs
exterior doors
balconies
fire hazards
or other hazards
may be needed while assessment is taking place.
Fire safety
Someone with night-time seizures should still have ordinary household fire protection.
This may include:
functioning smoke alarms
appropriate carbon monoxide alarms where relevant
accessible escape routes
and a household emergency plan.
Fire-safety regulations and services vary internationally.
Local fire-safety authorities may provide additional guidance or assessments in some countries.
Avoid locking someone into a room
Trying to prevent nocturnal wandering by making escape impossible can create serious danger during:
fire
medical emergency
or evacuation.
Security measures should always allow safe emergency exit.
What if seizures happen in a top bunk?
Where a person has seizures involving:
falls
convulsions
impaired awareness
or wandering,
a top bunk may create unnecessary fall risk.
A lower sleeping surface may be safer.
This should be assessed according to the individual rather than being applied to every person with epilepsy.
What if someone shares a bed with another person?
This is common and not automatically unsafe.
The partner should ideally know:
the person's usual seizures
how to provide first aid
whether rescue medication exists
what normal recovery looks like
and when to seek emergency help.
If seizures involve violent movement, both people may need to consider potential injury risk.
Partners need sleep too
Night-time monitoring can create significant caregiver sleep loss.
Repeatedly waking to:
alarms
movement
sounds
or fear of missing a seizure
can cause serious exhaustion.
A safety plan that destroys a carer's ability to sleep may not be sustainable.
The person's independence and the supporter's health both matter.
When should night-time seizures be reviewed by an epilepsy specialist?
Review is particularly important when:
they are new
seizure frequency is increasing
a new seizure type appears
tonic-clonic seizures continue
significant injuries occur
seizures become prolonged
clusters develop
the person is unaware of many events
or treatment is not achieving seizure freedom.
Persistent seizures despite appropriate treatment may warrant assessment for drug-resistant epilepsy and tertiary specialist care.
Related Information Hub pages:
Drug-Resistant Epilepsy: What It Actually Means
Tertiary Epilepsy Centres: What Happens When You're Referred?
What if seizures are suspected but not confirmed?
Do not automatically build a permanent safety system around an uncertain diagnosis.
First establish what is happening where possible.
Useful evidence may include:
witness accounts
home video
seizure diary
routine or sleep EEG
ambulatory EEG
video EEG telemetry
or a formal sleep study where parasomnia is possible.
Related Information Hub page:
Sleep Studies, Parasomnias and Nocturnal Events
A home camera can help reveal the pattern
When used consensually and appropriately, a camera may show:
time of the event
movement
body position
duration
whether several events occur
and recovery.
This information can be valuable to an epilepsy specialist.
But the camera should not be interpreted as a substitute for medical diagnosis.
Privacy must be considered
Night-time monitoring can capture extremely private information.
Consider:
who can view recordings
whether footage is stored online
security of the account
how long footage is retained
whether another person sharing the room has consented
and whether audio is also recorded.
A device being medically useful does not eliminate privacy considerations.
Do not post seizure footage publicly just to obtain a diagnosis
A person's seizure video is sensitive health information.
Where possible, it should be shown securely to:
their neurologist
epilepsy specialist
or another appropriate clinician.
Public social-media opinion cannot reliably diagnose epilepsy from a video.
What if a monitor suddenly reveals many more seizures?
This does not necessarily mean the epilepsy suddenly became worse.
The events may have been occurring previously without being noticed.
Improved detection can make seizure frequency appear to rise because measurement became more accurate.
Related Information Hub page:
Seizure Diaries and Videos: How to Record Useful Evidence
What if the device gives dozens of alarms but no seizures are visible?
False alarms occur.
Possible causes include:
normal sleep movement
repetitive activity
device displacement
heart-rate changes
or technical problems.
Do not automatically classify every alert as a seizure.
Review the data with the epilepsy team where appropriate.
Should everyone with nocturnal epilepsy buy a seizure detector?
No.
The ILAE/IFCN guideline supports use of automated wearable detection as an adjunct for selected people, particularly when reliable detection of tonic-clonic seizures is clinically important.
The decision should consider:
seizure type
evidence supporting the device
who will respond
false alarms
cost
privacy
comfort
availability
and individual risk.
Questions to ask before buying a monitoring device
Useful questions include:
Which seizure type does it detect?
Has it been tested specifically for tonic-clonic, focal or other seizures?
Was it tested against video EEG?
What is its sensitivity?
How often does it produce false alarms?
Was it tested in people's homes or only in hospital?
What happens if the internet or power fails?
Who receives the alert?
How quickly can they respond?
Is it medically regulated in my country?
Does it require a subscription?
What happens to my health data?
Questions to ask an epilepsy clinician
Useful questions include:
What type of seizures am I having in sleep?
How certain are we that they are epileptic?
Am I likely to be missing seizures?
Do I need video EEG or ambulatory monitoring?
How does my night-time seizure pattern affect my individual SUDEP risk?
What is the most important risk factor I can change?
Would nocturnal supervision be useful for me?
Would a seizure alarm be useful for my seizure type?
What should somebody do if they are alerted?
Do I need rescue medication?
What seizure duration requires emergency help?
Could sleep apnoea or another sleep disorder also be present?
A simple night-time safety plan
A personalised plan might state:
Usual sleep seizure
What normally happens and approximately how long it lasts.
Expected recovery
What is normal afterwards.
Immediate first aid
How to protect the person and monitor them.
Rescue treatment
If prescribed, exactly when and how it should be given.
Breathing
What carers should expect and what constitutes an emergency.
Emergency threshold
When local emergency medical services should be contacted.
Monitoring
Which device or method is being used and what it can realistically detect.
Contact information
Who should be informed after a significant event.
The plan should be understandable without needing to search for instructions in the middle of the night.
The plan should be reviewed when epilepsy changes
Review may be needed after:
a new tonic-clonic seizure
status epilepticus
a serious injury
increasing seizure frequency
medication changes
surgery
a new diagnosis
or changes in living arrangements.
A plan designed for a child may no longer be appropriate for the same person as an independent adult.
Global differences matter
Not everyone with epilepsy has access to:
specialist neurologists
overnight EEG
expensive wearable technology
rescue medication
epilepsy surgery
or continuous home supervision.
WHO estimates that nearly 80% of people with epilepsy live in low- and middle-income countries, where treatment gaps remain substantial.
Safety information therefore needs to remain useful even where technology is unavailable.
The most universally important measures include:
appropriate diagnosis
access to effective antiseizure treatment
taking prescribed medicine consistently
recognising seizure emergencies
knowing seizure first aid
reducing obvious environmental hazards
and seeking further medical review when seizures remain uncontrolled.
Expensive technology is not the foundation of epilepsy safety
Someone without:
a smartwatch
camera
bed alarm
or specialist mattress
can still improve safety through:
effective treatment
informed family or community members
a clear emergency plan
appropriate first aid
safer sleeping surroundings
and knowing when to seek emergency care.
This is particularly important for global epilepsy information.
Safety advice should not assume access to expensive equipment.
The most important message
Night-time seizures should not be dismissed simply because the person is asleep when they occur.
They can:
go unrecognised
disturb sleep
cause injury
complicate seizure counting
and, particularly when tonic-clonic seizures remain uncontrolled, contribute to serious epilepsy-related risk.
The most important strategy is better seizure control, especially control of tonic-clonic seizures.
The ILAE identifies this as the central modifiable measure for reducing SUDEP risk.
Night-time safety may also involve:
reducing hazards around the bed
having an emergency plan
ensuring others know seizure first aid
considering supervision in selected higher-risk situations
and considering seizure-detection technology where it is appropriate.
But none of these provides complete protection.
WHO currently says nocturnal supervision may be considered for SUDEP prevention, while explicitly rating the certainty of evidence as very low.
Wearable seizure detection is most reliable for tonic-clonic seizures and significantly less reliable for many focal and non-motor seizures. Current research does not prove that commercial seizure-detection devices prevent SUDEP.
So the aim should not be:
monitor every movement all night.
It should be:
understand the person's actual seizure pattern, improve seizure control wherever possible, reduce realistic hazards, and make sure that if a serious seizure occurs, there is a practical plan for responding to it.
Sources and further reading
International League Against Epilepsy — SUDEP.
International information on SUDEP mechanisms, night-time occurrence, convulsive seizures, seizure control, medication adherence and consideration of night-time supervision or monitoring in selected higher-risk people.
World Health Organization — Epilepsy.
WHO's global epilepsy information highlights approximately 50 million people affected worldwide, major treatment gaps and preventable epilepsy-related harms including injuries, drowning, burns and prolonged seizures.
World Health Organization — Prevention of SUDEP.
WHO currently states that nocturnal supervision should be considered for SUDEP prevention, while grading this as a conditional recommendation with very low certainty of evidence.
International League Against Epilepsy and International Federation of Clinical Neurophysiology — Clinical practice guideline on automated seizure detection.
Supports automated wearable seizure detection as an adjunct in selected people when reliable detection of tonic-clonic seizures is clinically important, while recognising substantially weaker evidence for other seizure types.
Automated seizure detection using wearable devices — systematic review and meta-analysis, 2026.
Thirty-one tonic-clonic seizure studies involving more than 2,000 participants produced pooled detection sensitivity of approximately 90%, while false alarms remained important and focal seizure detection was less reliable.
Ambulatory seizure detection — Current Opinion in Neurology, 2024.
Reviews advances in accelerometry, electrodermal activity, photoplethysmography and other ambulatory seizure-detection methods, with strongest performance for tonic-clonic seizures.
Performance and experiences of wearable seizure-detection devices in community settings — systematic review, 2024.
Highlights the difference between controlled validation studies and real-world use, including user experience, false alarms and practical limitations.
Current perspectives in SUDEP — 2026 review.
Reviews current evidence on tonic-clonic seizures, nocturnal events, respiratory dysfunction, arousal, sleep and other mechanisms under investigation in SUDEP.
American Academy of Neurology/American Epilepsy Society SUDEP guideline.
For selected people with frequent tonic-clonic and nocturnal seizures, clinicians may discuss nocturnal supervision or remote listening precautions while considering individual circumstances and the burden of monitoring.
Epilepsy Foundation — Safety While Sleeping and SUDEP Prevention.
Provides practical international-facing safety information regarding night-time hazards, seizure monitoring and limitations of specialised pillows and seizure-detection devices.
Information reviewed: September 2026.
This page provides general educational information for an international audience. Emergency numbers, available monitoring technology, rescue medicines, referral systems and clinical services vary by country. Follow the person's individual epilepsy care plan and local emergency medical guidance where these are available.
