Night Terrors vs. Nightmares in Toddlers: What to Do

Your toddler is thrashing, screaming, maybe even sitting up with their eyes wide open — and nothing you say seems to reach them. It’s one of the most alarming things a parent can witness, and yet it’s often completely different from what it looks like. Here’s how to tell night terrors and nightmares apart, and what actually helps with each.

Night terrors vs. nightmares: what’s the real difference?

They look similar from the outside — a child in distress in the middle of the night — but they come from different parts of the sleep cycle, and that’s why the right response is different too.

	Night terrors	Nightmares
When they happen	First third of the night, deep non-REM sleep	Usually later in the night, during REM sleep
What it looks like	Screaming, thrashing, sweating, eyes may be open; child seems awake but isn’t	Child wakes up crying or scared, fully alert
Do they remember it?	No memory the next morning	Often remembers the dream vividly
Can you wake them?	Very hard to wake, and waking them mid-episode tends to prolong it	They’re already awake and can be comforted directly
Typical age	~18 months–6 years, peak 2–4 years	Common from about age 2-3 onward, once imagination and language develop
What helps most	Staying nearby, keeping them safe, waiting it out	Comfort, reassurance, a brief chat, help falling back asleep

The short version: a night terror is a sleep-cycle event your child isn’t actually conscious for, even though it looks frightening. A nightmare is a bad dream your child wakes up from and genuinely experiences.

Why night terrors happen

Night terrors happen during the deepest stage of non-REM sleep, usually 1-3 hours after bedtime, when a young child’s brain is transitioning between sleep stages. In toddlers and preschoolers, that transition system is still maturing, so the brain can get “stuck” partway between deep sleep and waking — the body acts distressed while the child stays asleep underneath it. It isn’t caused by anything scary your child saw or experienced, and it isn’t something they’re aware of happening.

A few things make night terrors more likely on a given night:

• Overtiredness — an overtired child spends more time in deep non-REM sleep, which is exactly when terrors occur.
• An inconsistent or disrupted sleep schedule.
• A fever or illness.
• A full bladder or being too warm.
• Sleeping somewhere unfamiliar (travel, a new bed).

What to do during a night terror

1. Don’t try to wake them. It rarely works, and it tends to prolong the episode and leave your child more disoriented if it does work.
2. Stay close and keep them physically safe. Move anything they could bump into, and gently prevent them from falling if they’re thrashing or trying to move.
3. Speak calmly, but don’t expect a response. Your voice can help, but your child isn’t really hearing or processing it the way they would while awake.
4. Wait it out. Most episodes last 5-15 minutes and end with the child settling back into normal sleep, often without ever fully waking.
5. Don’t mention it in the morning unless your child brings it up — they genuinely won’t remember, and bringing it up can confuse or worry them for no reason.

What to do after a nightmare

Nightmares are a different situation, because your toddler is awake, scared, and aware of what just happened.

• Go to them and comfort them directly — a nightmare responds to reassurance in a way a night terror doesn’t.
• Keep the light dim and your response calm, rather than fully waking everyone up with bright lights.
• Let them talk about it briefly if they want to, but don’t dwell on it or ask a lot of questions right before trying to resettle.
• Help them fall back asleep in their own bed if possible, using your normal soothing routine — this reinforces that their own bed is a safe place to be.
• A comfort object or a quick check of the room (“no monsters, all safe”) can help at this age, when imagination is developing faster than the ability to reason it away.

How to reduce how often they happen

Because both are strongly linked to sleep pressure and consistency, the same groundwork helps with both:

• Protect an age-appropriate bedtime — see our wake windows by age guide to check your toddler isn’t running overtired.
• Keep the sleep schedule consistent, including on weekends and during travel when possible.
• Watch for overtiredness triggers like a skipped nap or a late bedtime, which are the most common short-term cause of a spike in episodes.
• Treat any illness or fever, since both raise the odds of a night terror on a given night.

If bedtime itself has become a struggle independent of terrors or nightmares, our guide to toddler bedtime battles covers that separately.

When to check with your pediatrician

Most night terrors and nightmares don’t need medical attention. It’s worth bringing up with your pediatrician if episodes happen very frequently (several times a week), involve your child leaving the bed and being at risk of injury, continue past early elementary age, or if you notice snoring or breathing pauses during sleep — sleep-disordered breathing can sometimes increase night terrors and is worth ruling out separately.

The bottom line

Night terrors and nightmares look similarly frightening but need opposite responses: stay nearby and wait out a night terror without waking your child, and go to your child and comfort them directly after a nightmare. Both usually ease with a consistent, well-timed sleep schedule, and most children outgrow night terrors entirely by early elementary school. If you’re not sure whether general overtiredness is part of the picture, our guide to why won’t my baby sleep covers the wider picture.