Many people have seizures only at night during sleep — and neither they nor their family realise it. Dr. Anand Karnam explains the signs of nocturnal epilepsy and why it is under-diagnosed.
Key Points
- Nocturnal seizures occur during sleep — typically during the non-REM stages of sleep transition.
- Signs of nocturnal seizures: unexplained tongue biting, urinary incontinence, bedding disturbance, or postictal confusion on waking.
- Video EEG (recording overnight with simultaneous brainwave monitoring) is the definitive investigation.
- BECTS (childhood benign epilepsy with centrotemporal spikes) is the most common nocturnal childhood epilepsy.
- Untreated nocturnal seizures are associated with SUDEP (Sudden Unexpected Death in Epilepsy) — treatment is important.
40%
of all seizures in people with epilepsy occur exclusively or predominantly at night
Source: ILAE
0.3–0.4 per 1,000
annual SUDEP rate — reduced by seizure control and medication adherence
Source: ILAE
80%
of BECTS (most common nocturnal childhood epilepsy) resolves by age 16
Source: NCBI
"Patients often present after years of 'restless sleep' that turned out to be nocturnal seizures. The clue is unexplained tongue biting or confusion on waking. Video EEG makes the diagnosis clear and changes management completely."
Approximately 20–40% of people with epilepsy experience seizures primarily or exclusively during sleep — nocturnal seizures. These are frequently missed for months or years because no witness observes them and the patient wakes with no clear memory of the event. The only clues may be indirect: biting the tongue, waking with unexplained muscle aches, finding the bed sheets thrown off, or a partner reporting unusual movements or vocalisations during the night.
Why Seizures Cluster During Sleep
Sleep profoundly affects seizure threshold. During non-REM sleep — particularly stage N2 and slow-wave sleep — there is increased synchronisation of neuronal firing, which facilitates seizure propagation. This is why juvenile myoclonic epilepsy (JME) produces myoclonic jerks and generalised seizures on waking; frontal lobe epilepsy characteristically produces brief nocturnal motor seizures; temporal lobe epilepsy has increased seizure frequency in early morning.
Signs That Suggest Nocturnal Seizures
- Waking with a bitten tongue (lateral tongue bite — a specific sign of generalised tonic-clonic seizure during sleep)
- Unexplained urinary incontinence during sleep
- Waking with severe muscle aches, headache, and exhaustion
- Morning confusion lasting 30 minutes or more (prolonged postictal state)
- Partner reports loud moaning, rhythmic movements, or falling from bed at night
- Unexplained bruises from falling out of bed
Diagnosis and Treatment
Video-EEG monitoring (recording EEG simultaneously with video during sleep) is the gold standard — capturing and correlating the patient's movements with the EEG during an actual event. Sleep-deprived EEG has higher diagnostic yield than routine EEG. Differentiate from non-epileptic sleep disorders: REM sleep behaviour disorder (acting out dreams — no EEG changes), night terrors (in children), and sleep apnea (which can trigger seizures). Treatment with appropriate ASM often dramatically improves quality of life — waking refreshed rather than exhausted. Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.
Dr. Anand Karnam
DrNB Neurology · Sri Anand CNC, Chanda Nagar Hyderabad · Sri Anand Child and Neuro Center
DrNB-qualified Neurologist, Fellow of the World Headache Society (FWHS), and Headache Specialist with 12+ years of experience treating epilepsy, stroke, migraine, and movement disorders. Practices at Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad.
References & Sources
- 1.Epilepsy — WHO Fact Sheet — World Health Organization
- 2.Nocturnal Seizures — NCBI StatPearls — NCBI StatPearls
- 3.Sleep and Epilepsy — ILAE — International League Against Epilepsy
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