Your child sits bolt upright at 11 p.m., screams, sweats, eyes open and unseeing, and won't be comforted. Twenty minutes later, they collapse back into bed and sleep through the morning with no memory of any of it. This is a night terror — a non-REM parasomnia, not a nightmare, and not a sign that anything is wrong with your child. Around 30 per cent of children experience at least one episode, with peak incidence between ages 4 and 8. Most outgrow them entirely by adolescence. Healthbooq covers paediatric sleep disruptions and parasomnias across early childhood.
Night Terrors Are Not Nightmares
This distinction matters because the response is different.
| | Night terror | Nightmare |
|—|—|—|
| Sleep stage | Deep non-REM (slow-wave) | REM |
| Time of night | First third (often within 1–3 hours of falling asleep) | Second half |
| Child's consciousness | Unconscious — cannot hear or see you | Awake, frightened, can talk to you |
| Memory of event | None | Often vivid |
| What helps | Stay near, keep safe, do not wake | Comfort, reassure, stay until calm |
A child who comes into your bed at 5 a.m. crying about a monster had a nightmare. A child who sits up at 10:30 p.m. screaming with their eyes open but who doesn't recognise you had a night terror.
What's Actually Happening Neurologically
During slow-wave sleep — the deepest stage, concentrated in the first third of the night — the brain periodically transitions to lighter sleep. In a night terror, that transition stalls. The autonomic nervous system fires (fast heart rate, racing breath, sweating, dilated pupils, sometimes piloerection) but the cortex doesn't come fully online. The child is, in effect, in two states at once — physiologically aroused but cognitively still asleep.
This is why nothing you do gets through. The conscious brain isn't in the room.
Children spend roughly 20–25 per cent of the night in slow-wave sleep, compared with about 13–15 per cent in adults — which is why parasomnias of this kind are largely a childhood phenomenon. As sleep architecture matures, these transitions get cleaner, and the episodes stop.
Who Gets Them, and What Triggers Them
Genetic component is real. Around 80 per cent of children with night terrors have a first-degree relative with a history of either night terrors or sleepwalking. If you or your partner had them as a child, expect a higher chance for your child.
The triggers that reliably increase frequency:
- Overtiredness. The single most consistent trigger. A short-on-sleep brain spends more time in slow-wave sleep on the rebound, with more turbulent transitions out of it. This is why later bedtimes make night terrors worse, not better.
- Illness, particularly with fever. A child running a temperature has dramatically more night terrors that week.
- Stress or change. Starting nursery, a new sibling, a house move, a parent travelling.
- Inconsistent sleep schedule. Big variation between weekday and weekend bedtimes.
- Sleeping somewhere unfamiliar. Hotels, grandparents' houses.
- A full bladder. Some children's episodes resolve when they're toilet-trained or stop drinking before bed.
- Medications. Certain antihistamines, stimulants, and SSRIs are associated; worth raising with the GP if a new medication coincides with new episodes.
What to Do During an Episode
Keep them safe and let it pass. That's it.
- Don't try to wake them. It prolongs the episode and leaves them more confused when they finally do come round.
- Don't restrain. Forced restraint intensifies the autonomic response.
- Stay close enough that they can't fall out of bed, hit furniture, or hurt themselves. If your child also sleepwalks — about 30 per cent of children with night terrors do — fit a stair gate, lock external doors, and consider a door alarm.
- Don't switch on bright lights. A jolt of light into a half-asleep brain pushes them into a confused half-wakefulness, which is worse than the original episode.
- Speak softly if you want, but don't expect a response. Some parents find a calm steady voice helps; the child can't hear you, but you may feel less helpless saying it.
Episodes typically last 5–20 minutes (occasionally up to 30). When it's over, the child usually rolls over and slides back into sleep without ever fully waking. Don't ask them about it in the morning — they have no memory, and asking can plant anxiety where there was none.
What Actually Helps Reduce Frequency
Move bedtime earlier. Counterintuitive but well-established. A child having frequent night terrors almost always benefits from 30–60 minutes earlier sleep onset. Track this for two weeks before assuming it isn't working.
Protect naps for younger children. Cutting the nap before a child is ready means more sleep pressure at night, which means more slow-wave sleep, which means more terrors.
Keep schedule consistent across the week. Weekend lie-ins look like a treat but they desynchronise the circadian rhythm.
Address fevers and illness promptly. Paracetamol or ibuprofen for a febrile child both treats the discomfort and reduces the likelihood of a terror that night.
Check for OSA. Children with obstructive sleep apnoea have disrupted slow-wave sleep and a higher rate of parasomnias. Loud habitual snoring, pauses in breathing, restless sleep — refer to ENT for adenotonsillar assessment.
Scheduled Awakening: The One Intervention With Evidence
If episodes are happening most nights at roughly the same time, scheduled awakening is the technique with the best evidence base — small studies, but consistent results.
How to do it:
- Track episodes for one to two weeks. Note the time each one starts.
- Identify the typical window (e.g., usually between 10:15 and 10:45 p.m.).
- About 15 minutes before that window, gently rouse the child — just enough to shift them out of deep sleep. A light touch, repositioning, a soft "you're okay" — not fully waking them.
- Continue nightly for 2–4 weeks, then taper.
The mechanism: you're nudging the brain past the partial-arousal point so it doesn't stall there. Most families see frequency drop within 2 weeks. If the rouse fails to wake them slightly, you weren't gentle enough — but if it fully wakes them, you're disrupting the whole cycle, and they'll be tired the next day. Find the lightest touch that produces a stir.
When to Call the GP
Most night terrors are benign and self-limiting. Book an appointment if:
- Episodes are injuring the child (sleepwalking with stairs, climbing, leaving the house)
- Episodes happen multiple times in one night
- They consistently last longer than 30 minutes
- They start after age 8 for the first time, or persist into adolescence
- There are rhythmic, stereotyped movements (jerking that repeats in the same pattern) — this raises the question of nocturnal frontal lobe seizures, which can mimic parasomnias and need EEG assessment
- The child is excessively sleepy during the day, or behaviour or learning are noticeably affected
- There's loud snoring or witnessed pauses in breathing — refer to ENT for OSA assessment
For safety in a child who also sleepwalks: stair gate, locks, ground-floor sleep arrangement, consider a bed-exit alarm.
Night terrors look terrible. They are also, in the vast majority of children, neurologically harmless and outgrown. The child is not suffering during the episode — only the parent is.
Key Takeaways
Night terrors are a non-REM parasomnia: the brain gets stuck partway through a transition out of deep slow-wave sleep, the autonomic nervous system fires, and the child appears terrified while remaining unconscious. They are not nightmares. Around 30 per cent of children have at least one episode; peak age is 4–8 years. They almost always resolve by adolescence. The strongest trigger is overtiredness, so the most useful intervention is an earlier bedtime, not a later one. The only behavioural intervention with reasonable evidence is scheduled awakening — a gentle rouse 15 minutes before the usual episode time.
