Night terrors vs nightmares: how to tell the difference

By Tim Khuja · 7 min read

Last reviewed June 9, 2026

If you've ever stood in your child's doorway at 1am watching them sit up, eyes wide open, screaming for you — and somehow not actually seeing you — you already know night terrors don't feel like a regular bad dream. They feel like something is deeply, frighteningly wrong.

The good news: nothing is wrong. Night terrors are a normal (if unsettling) part of how some children's nervous systems wake up. But they are very different from nightmares, and the difference matters because the response is different too.

The simplest way to tell them apart

Nightmares happen during REM sleep, usually in the second half of the night. Your child wakes up fully, remembers the dream, and wants comfort. They know you're there. They can talk about what scared them.

Night terrors happen during deep non-REM sleep, usually in the first 1–3 hours after falling asleep. Your child is not awake, even though their eyes might be open. They don't recognise you. They won't remember it in the morning.

That last detail is the cleanest test. If your child can describe it the next day, it was a nightmare. If they have no memory of it at all, it was a night terror.

What's actually happening in the brain

During a night terror, the brain is stuck halfway between deep sleep and arousal. The body switches on the fight-or-flight system — racing heart, sweating, dilated pupils, sometimes thrashing or running — while the conscious, thinking parts of the brain stay offline.

This is why your child can't be reasoned with, comforted, or "woken up" mid-terror. There's nobody home to talk to. The cortex is still asleep.

Nightmares are the opposite. The brain is fully online and processing emotional content through story — fear of separation, big feelings from the day, something they saw or overheard. The dream is a way of metabolising it.

What to do during a night terror

The instinct is to grab them, hold them, wake them up. Almost every expert source — the American Academy of Pediatrics, the NHS, the Mayo Clinic — says the same thing: don't.

• Stay close. Keep them safe. Move sharp things out of the way.
• Don't try to wake them. It usually makes the episode longer and more intense.
• Don't ask questions. Don't turn on bright lights. Don't restrain unless they're about to hurt themselves.
• Wait. Most episodes pass in 5–20 minutes. They'll lie back down and continue sleeping like nothing happened.

In the morning, don't bring it up unless they do. They have no memory of it, and describing it to them can actually plant new fears.

What to do after a nightmare

Here, the playbook flips. Your child is awake and scared, and the comforting matters.

• Go to them. Use your calmest voice.
• Name what happened: "You had a scary dream. You're safe. I'm here."
• Don't dismiss it ("It wasn't real") — to their nervous system, it absolutely was. Validate first.
• Stay until their breathing slows. A short story, a song, a hand on their back.
• In the morning, you can revisit it gently if they want to. Drawing the dream and giving it a silly ending is a classic technique that works.

When to actually worry

Most night terrors resolve on their own by age 10–12 as the sleep cycle matures. They're not a sign of psychological distress. But check in with your paediatrician if:

• Episodes happen multiple times a night
• They include sleepwalking that puts your child in danger
• They're paired with snoring, gasping, or pauses in breathing (could be sleep apnoea, which is a known trigger)
• They started suddenly in an older child or teenager
• Daytime sleepiness is significant

For nightmares, a pattern worth paying attention to is when the same fear keeps appearing night after night, or when bedtime starts to feel unsafe to your child. That's worth exploring — gently, in daylight, often through story.

The overlap nobody talks about

A few things make both more likely: being overtired, being sick, big transitions (new school, new sibling, travel), and inconsistent sleep schedules. The single biggest lever for reducing both is the boring one — earlier bedtimes and more consistent sleep.

Stress in the family system also feeds both, but in different ways. Nightmares often surface emotional content the child hasn't been able to talk about. Night terrors are usually more about sleep architecture than psychology, though chronic stress can disrupt the deep-sleep cycles that produce them.

What your child needs from you

For nightmares: a witness. Someone who treats the fear as real, even though the monster wasn't.

For night terrors: a guardian. Someone who stays close, keeps them safe, and doesn't make it bigger than it needs to be.

In both cases, what builds long-term safety isn't the perfect response in the moment — it's knowing, in their bones, that you'll come.