Nightmares vs night terrors

At 2am, a child who is screaming in bed looks the same regardless of what is happening in their brain. They are two very different phenomena, and the distinction determines what you do next.

Nightmares

Nightmares are frightening dreams that occur during REM sleep. They are most common in the second half of the night, when REM sleep is longest. The child wakes fully from the dream, remembers it (often in vivid detail), and comes to the parent for comfort. They can describe what happened, they respond to reassurance, and they often struggle to return to sleep without support.

Nightmares are a normal part of child development, peaking between ages 3 and 6. They are more common in the wake of anxiety-producing experiences — a scary movie, a stressful day, a family change, or a developmentally expected period of increased fears (around ages 4, 6, and 11).

Night terrors (confusional arousals / sleep terrors)

Night terrors are a parasomnia — they occur during deep non-REM sleep, typically in the first third of the night (often 60–90 minutes after falling asleep). The child appears awake — eyes open, sitting up, screaming — but they are not. They are in a partial arousal from deep sleep and have no access to language or environment.

Night terrors can last 5–30 minutes. During the episode the child does not respond to comfort, does not recognise parents, may thrash, stare through you, sweat, breathe rapidly, and appear genuinely terrified. And then, as suddenly as it began, they return to sleep. In the morning, they have no memory of it.

How to tell them apart in the moment

• Timing. Nightmares: second half of the night. Night terrors: first third (usually 10pm–1am for school-age children).
• Responsiveness. Nightmare child responds to comfort, recognises you. Night terror child does not.
• Eyes. Nightmare child looks at you. Night terror child looks through you.
• Morning memory. Nightmare child remembers the dream. Night terror child has no memory.
• Your heart rate. You will feel terrified watching a night terror. You will feel comforting watching a nightmare.

What to do with a nightmare

1. 1Go to the child. Pick them up if they ask, sit beside them if they do not.
2. 2Reassure in short sentences — 'You had a bad dream. You're safe. I'm here.'
3. 3Do not interrogate the dream. Extended discussion at 2am of the dream content tends to re-activate the fear rather than settle it.
4. 4Stay until they settle. This may be a few minutes; it may be longer.
5. 5In the morning, if they want to talk about it, listen briefly and redirect to the day.

Recurrent nightmares — more than twice a week, over several weeks, in the context of visible daytime anxiety — are worth a conversation with your GP, and often benefit from brief psychology input. The technique most used is 'imagery rehearsal therapy' — a cognitive-behavioural approach adapted for children.

What to do with a night terror

Counter-intuitively, the rule is: do not wake them.

1. 1Keep them physically safe — guide them back to bed if they are moving, move obstacles, but do not restrain unless they are about to hurt themselves.
2. 2Do not try to comfort, reason, or wake them. They are not accessible to any of those. Attempts to wake them usually extend the episode.
3. 3Stay present. Wait it out.
4. 4When they return to sleep on their own (this will happen), tuck them in and go back to bed.
5. 5Do not mention it in the morning unless they bring it up. They will have no memory.

When night terrors are more than a phase

Night terrors peak between ages 3 and 7 and usually resolve by adolescence. They are often familial — night terrors and sleepwalking run in families. They are not caused by anxiety or trauma, and they are not psychological events. They are a quirk of deep-sleep architecture.

Consider a paediatric sleep discussion if:

• Night terrors are happening more than once or twice a week for multiple weeks.
• They are occurring in combination with sleep walking, sleep talking, or other parasomnias that are making nights unsafe.
• The child is also snoring or mouth-breathing — obstructive sleep apnoea can trigger parasomnias.
• They continue past adolescence with no decrease.

The one rule that matters for both

Protect the whole night's sleep. Children who are overtired have more nightmares and more night terrors. Adequate total sleep, consistent wake times, and a wound-down bedtime environment reduce the frequency of both phenomena more than any other intervention.

At 2am you do not need to remember the difference between REM and non-REM architecture. You need the simple rule: if they recognise you and want to be comforted, comfort them. If they are looking through you, wait it out. Most parents get this one right on instinct. Most parents also think they have done something wrong. They usually have not.