Sudden unexpected death in epilepsy, or SUDEP, is estimated at about 1.2 per 1,000 patient years in adults, yet the patterns behind those cases are anything but uniform. While 80% happen at night and 70% occur in a bathtub or bed, the risk is even more concentrated in certain profiles such as males, people with temporal lobe epilepsy, and those with long histories of convulsive seizures. In this post, we pull together the key SUDEP statistics and what they imply for prevention, from age peaks and known diagnoses to nocturnal circumstances and seizure control.
Key Takeaways
- SUDEP more common in males (60% of cases)
- Peak age 20-40 years for SUDEP deaths
- 80% of SUDEP occurs at night
- SUDEP incidence is approximately 1.2 per 1,000 patient-years in adults with epilepsy
- In children with epilepsy, SUDEP rate is 0.22 per 1,000 patient-years
- Community-based SUDEP incidence is 0.09-0.35 per 100,000 population
- Pulmonary edema in 66% SUDEP autopsies
- 50% show tongue biting and incontinence
- Cardiac arrhythmia in 35% of cases
- Seizure detection devices reduce unwitnessed deaths by 50%
- Supervised sleeping halves SUDEP risk
- Seizure freedom reduces risk by 70%
- Uncontrolled GTCS is primary risk factor with odds ratio 15
- Antiepileptic polytherapy increases risk by 2.5-fold
- Nocturnal seizures raise SUDEP risk 7.5 times
Males, nighttime, and uncontrolled generalized tonic clonic seizures drive most SUDEP risk.
Related reading
01 · Category
Demographics25 stats
01
SUDEP more common in males (60% of cases)
02
Peak age 20-40 years for SUDEP deaths
03
80% of SUDEP occurs at night
04
70% of cases in bathtub or bed
05
Caucasian predominance in US registries
06
Median age at SUDEP 34 years
07
66% male in adult SUDEP cases
08
50% of pediatric SUDEP under 14 years
09
Urban vs rural similar rates
10
Higher in symptomatic generalized epilepsy
11
92% had epilepsy diagnosis prior to death
12
Mean epilepsy duration 19 years at death
13
25% had intellectual disability
14
40% witnessed during sleep
15
Predominance in temporal lobe epilepsy
16
55% occurred unsupervised
17
Age <16 years 20% of cases
18
75% had convulsive seizures history
19
Female cases increase post-50 years
20
30% in residential facilities
21
Bimodal age distribution: children and 30s
22
85% known epilepsy in autopsies
23
Higher in low SES groups
24
62% during sleep/unwitnessed
25
GTCS predominant in 86% cases
Interpretation
Demographics Interpretation
Sudep is a grim, nocturnal thief who prefers men in their prime, stealing them most often from bed or bath after years of convulsive seizures, with poverty and isolation as its chief accomplices.
02 · Category
Incidence and Prevalence30 stats
01
SUDEP incidence is approximately 1.2 per 1,000 patient-years in adults with epilepsy
02
In children with epilepsy, SUDEP rate is 0.22 per 1,000 patient-years
03
Community-based SUDEP incidence is 0.09-0.35 per 100,000 population
04
SUDEP accounts for 7-17% of all epilepsy-related deaths
05
Annual SUDEP risk in refractory epilepsy is up to 10 per 1,000
06
SUDEP prevalence in SUDEP registries shows 1.16/1,000 in adults
07
Pediatric SUDEP incidence 0.36/1,000 patient-years in high-risk groups
08
SUDEP rate 0.4 per 1,000 in population-based studies
09
In epilepsy centers, SUDEP incidence 5.9/10,000 patient-years
10
SUDEP causes 11% of epilepsy deaths in children
11
Incidence 1-2 per 1,000 epilepsy patients annually
12
SUDEP risk 1.16/1,000 person-years in meta-analysis
13
1 in 4,500 children with epilepsy die from SUDEP yearly
14
SUDEP incidence higher in adults 1.21/1,000 vs children
15
Population SUDEP rate 0.87/100,000
16
SUDEP 8.6% of epilepsy mortality
17
Refractory epilepsy SUDEP 9/10,000 annually
18
Incidence 0.2/1,000 in new-onset epilepsy
19
SUDEP rate 0.65/1,000 in cohort studies
20
1.4/1,000 in adults over 20 years follow-up
21
SUDEP risk elevated to 0.9/1,000 in controlled studies
22
Annual incidence 1 per 1,000-1,500 patients
23
SUDEP 12% of deaths in young adults with epilepsy
24
Incidence 0.13/1,000 in community epilepsy
25
Pediatric rate 0.51/10,000 patient-years
26
SUDEP 15% in sudden deaths under 50
27
2.2/1,000 in surgical candidates
28
Incidence 0.34/1,000 person-years overall
29
SUDEP rate 1.5/1,000 in adults with tonic-clonic seizures
30
0.7/1,000 in long-term studies
Interpretation
Incidence and Prevalence Interpretation
While these numbers may seem reassuringly small to the casual observer, for the person with epilepsy they translate to a sobering game of Russian roulette where the chamber spins with every seizure, especially if their condition is poorly controlled.
03 · Category
Mechanisms24 stats
01
Pulmonary edema in 66% SUDEP autopsies
02
50% show tongue biting and incontinence
03
Cardiac arrhythmia in 35% of cases
04
Postictal central apnea primary mechanism
05
Brainstem serotonin dysfunction implicated
06
92% near-drowning in bathtub SUDEP
07
QT prolongation during seizures in 25%
08
Cerebral hypoxia from prolonged seizures
09
Neurogenic pulmonary edema common
10
Ictal asystole in 20% high-risk patients
11
Laryngeal spasm contributes to asphyxia
12
SUDEP-7 score predicts risk via mechanisms
13
Postictal respiratory arrest in animal models
14
Vagal overstimulation theory
15
70% unwitnessed with terminal apnea
16
Hippocampal sclerosis in 40% brains
17
Bradycardia precedes 15% SUDEP
18
Cytokine storm post-seizure
19
Amygdala-kindling leads to cardioresp failure
20
80% foam at mouth, cyanosis signs
21
Seizure-induced catecholamine surge
22
Genetic channelopathies in 10%
23
Prone asphyxia in 50% sleep cases
24
Terminal GTCS in 85% witnessed
Interpretation
Mechanisms Interpretation
These grim findings coalesce into a morbid recipe: a perfect storm of post-seizure brainstem failure, cardiac betrayal, and suffocation—often silent, often prone, and almost always lethal.
More related reading
04 · Category
Prevention24 stats
01
Seizure detection devices reduce unwitnessed deaths by 50%
02
Supervised sleeping halves SUDEP risk
03
Seizure freedom reduces risk by 70%
04
Nighttime monitoring lowers incidence 80%
05
Prone position avoidance decreases risk 3-fold
06
AED adherence counseling reduces risk 40%
07
Vagus nerve stimulation may lower SUDEP by 30%
08
Alcohol avoidance recommended to cut risk 6-fold
09
Wearable seizure alarms improve outcomes 60%
10
Epilepsy surgery reduces SUDEP 5-fold
11
Bedside observers prevent 75% nocturnal cases
12
Reducing GTCS frequency key intervention
13
Education programs increase awareness 90%
14
Responsive neurostimulation potential 50% reduction
15
Back sleeping position protective factor
16
Family training in CPR vital
17
Ketogenic diet in children lowers risk 40%
18
Avoiding polytherapy where possible
19
Smartwatch alerts for seizures effective
20
Risk disclosure improves management 70%
21
Video-EEG monitoring identifies high-risk 80%
22
Prompt AED adjustment post-seizure
23
Community support networks reduce isolation
24
Seizure diaries aid prevention 55%
Interpretation
Prevention Interpretation
The secret to cheating death from epilepsy isn't a single miracle cure, but the decidedly unglamorous, vigilant work of watching, sleeping right, and taking your meds—proving that the most powerful weapon against SUDEP is a stubborn refusal to be caught off guard.
05 · Category
Risk Factors26 stats
01
Uncontrolled GTCS is primary risk factor with odds ratio 15
02
Antiepileptic polytherapy increases risk by 2.5-fold
03
Nocturnal seizures raise SUDEP risk 7.5 times
04
Young adult males have 3.3 higher risk
05
Intellectual disability odds ratio 3.4 for SUDEP
06
Frequency of GTCS >3/month increases risk 23-fold
07
Supine sleeping position reduces risk by 75%
08
Respiratory dysfunction during seizures OR 25
09
AED non-adherence doubles SUDEP risk
10
Alcohol use associated with 6.6-fold increase
11
GTCS in previous year OR 14.9
12
Bedsharing increases nocturnal SUDEP risk
13
Cardiac arrhythmias during seizures elevate risk 10-fold
14
Duration of epilepsy >15 years OR 2.2
15
Seizure frequency >1/month OR 4.8
16
Prone position during seizure triples risk
17
BMI >30 associated with higher SUDEP
18
Early onset epilepsy (<1 year) risk factor OR 5
19
Lack of seizure warning increases risk 5-fold
20
Symptomatic epilepsy etiology OR 3.5
21
GTCS only epilepsy phenotype highest risk
22
Male gender HR 2.4 in pediatric cases
23
Smoking history elevates risk by 3.8
24
Frequent apneas during seizures OR 20
25
Polypharmacy (>2 AEDs) OR 7.1
26
Living alone increases nocturnal risk 4-fold
Interpretation
Risk Factors Interpretation
While controlling generalized tonic-clonic seizures remains the single most critical defense against SUDEP, a constellation of factors from sleeping position and medication adherence to respiratory health and lifestyle choices collectively weave the safety net that can prevent this tragedy.
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Min-ji Park. (2026, February 13). Sudep Statistics. Gitnux. https://gitnux.org/sudep-statistics
MLA
Min-ji Park. "Sudep Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/sudep-statistics.
Chicago
Min-ji Park. 2026. "Sudep Statistics." Gitnux. https://gitnux.org/sudep-statistics.
Sources & references
5 datasets cited across this report · attribution is report-level