There are few sounds more alarming than your child screaming in the dark. You rush in, heart pounding, and find them sitting up, eyes wide, sobbing or thrashing — and somehow not seeing you. Or maybe it's the other version: a small voice at your bedside at 5 a.m., trembling about a monster that felt completely real. Both are frightening for a parent. The good news is that both are usually normal, and once you understand what's actually happening, you'll know exactly what to do — including the one situation where the right move is to do almost nothing.
The trick is that nightmares and night terrors look similar from the doorway but are completely different events under the hood. Let's untangle them.
Two very different things in the dark
The single most useful concept here is which kind of sleep your child is in. Sleep cycles between dreaming (REM) sleep and deep, dreamless (non-REM) sleep. Nightmares and night terrors come from opposite ends of that cycle, which is why they behave so differently.
Nightmares are scary dreams. They happen during REM sleep, which is concentrated in the second half of the night when dreaming is most intense, per the American Academy of Pediatrics. The defining features:
- Your child fully wakes up and becomes alert.
- They're frightened but recognize you and actively seek comfort.
- They can often remember and describe the dream ("there was a big dog").
- The American Academy of Sleep Medicine notes nightmares pull a child out of sleep and toward a parent — the opposite of a terror.
Night terrors (sleep terrors) are something else entirely: a partial arousal from deep non-REM sleep, not a dream at all. They strike early in the night, often before the parents' own bedtime, during the deepest sleep of the night (AAP). The hallmarks are unmistakable once you've seen one:
- Your child may scream, sit up, thrash, sweat, or look panic-stricken — but is not truly awake.
- They don't respond to you, may not recognize you, and can't be easily comforted or woken.
- In the morning, they have no memory of it (Mayo Clinic). You'll remember it vividly; they'll be cheerfully clueless.
Here's the quick cheat sheet: second half of the night, awake, remembers, wants you = nightmare. First part of the night, not really awake, won't remember, doesn't respond = night terror.
What to do for a nightmare
Nightmares call for exactly what your instincts tell you: show up and comfort. The AAP advises going to your child as quickly as you can and assuring them you're there.
- Be calm and present. A hug, a soft voice, "I'm here, you're safe." Your steadiness is the medicine.
- Acknowledge the fear without amplifying it. It felt real to them. "That sounds scary. It was a dream — dreams aren't real, and you're safe in your bed now."
- Keep it brief and sleepy. Resettle them in their own bed when you can, with their comfort object and a dim light, rather than starting a long conversation or relocating to your bed (a habit that's easy to start and hard to stop).
- Revisit in daylight if needed. If a nightmare really rattled them, a short, matter-of-fact chat the next day — maybe drawing the scary thing and giving it a silly ending — can drain its power.
A note on triggers: nightmares often spike with stress, big changes, overtiredness, and scary media. Trimming frightening shows, books, or games — especially near bedtime — genuinely reduces them.
What to do for a night terror (mostly: don't intervene)
This is the counterintuitive part, so it's worth stating clearly: do not try to wake or vigorously console a child during a night terror. It feels deeply wrong — every cell in your body wants to scoop them up — but waking them tends to prolong the episode or leave them more confused and upset. Both the AAP and the American Academy of Sleep Medicine are explicit: it's usually better to leave the child undisturbed, and they'll return to sleep quickly on their own. Mayo Clinic gives the same guidance — don't wake someone in the middle of a sleep terror.
So what do you do?
- Stay calm and stay nearby. Your job is lifeguard, not first responder.
- Keep them safe. Gently make sure they don't fall, climb out, or bump into anything. If they're moving around, steer them away from hazards.
- Speak little, soothe softly. A quiet, low voice is fine; don't shake, shout, or shine bright lights to "snap them out of it."
- Wait it out. Most terrors pass in a few minutes — the AASM notes sleep terrors tend to be brief — after which your child sinks back into normal sleep.
- Don't quiz them in the morning. They won't remember, and pressing the point can make them anxious about something they didn't even experience.
It is genuinely harder on you than on them. The child wakes up fine; the parent needs a cup of tea.
Why both are usually nothing to worry about
Take heart: these are common, and for the vast majority of kids, they're a passing phase tied to a developing brain.
Nightmares are very common in early childhood. The AAP notes they can begin as young as 6 months and peak between roughly ages 3 and 12 — right when imagination is exploding and kids are learning that scary things exist. Mayo Clinic similarly describes nightmares as common in childhood, often starting in the preschool years (Mayo Clinic).
Night terrors are less common but still firmly normal: the AASM reports they may affect as many as 6.5% of children, tend to begin around ages 4 to 12, and are usually self-limiting — meaning they fade on their own, typically resolving by adolescence (AASM). They also often run in families, so if you or your partner sleepwalked or had terrors as a kid, your child's are no surprise.
The biggest, most fixable trigger for night terrors is overtiredness and irregular sleep. A child who's chronically short on rest spends more time in the deep sleep where terrors brew. The most powerful prevention, then, is unglamorous: a consistent schedule with enough total sleep, and an earlier bedtime if they're running short. Illness, fever, and a too-full bladder can also set off an episode. (For age-by-age sleep needs and schedules, see our guides to wake windows by age and sleep regressions by age.)
Easing everyday bedtime fears
Separate from both of these is plain old fear of the dark, monsters, or being alone — a normal developmental milestone, not a sleep disorder, that tends to bloom in the preschool years as imagination outpaces logic. The goal is to take the fear seriously without confirming that it's justified.
- Keep a calm, predictable bedtime routine. Predictability is reassuring to an anxious brain; the wind-down itself signals safety.
- Allow a nightlight and a comfort object. A dim light and a beloved lovey are legitimate tools, not crutches. (More on the role of comfort objects in our post on thumb, pacifier, and lovey weaning.)
- Do a brief, matter-of-fact check — not a monster hunt. A theatrical search under the bed with "monster spray" can backfire by implying monsters are real enough to need spraying. A casual "all clear, goodnight" works better for many kids.
- Talk about it in daylight. A short, calm conversation when the sun's up — and naming the feeling — helps more than negotiating at the bedroom door.
- Mind the media. Scary or overstimulating content, especially in the hour before bed, is a reliable fear-feeder. Keep evenings gentle.
Most bedtime fears shrink with steady reassurance and time. Your unflappable confidence ("you're safe, I've got you, goodnight") is more convincing to a small child than any amount of logic about why monsters don't exist.
When to call your pediatrician
Most nightmares, terrors, and bedtime fears need patience, not a doctor. But reach out if:
- Episodes are frequent, escalating, or disrupting sleep for your child or the household.
- During a terror your child does anything dangerous — leaving the house, falling down stairs, hurting themselves.
- Episodes happen at the same time every night (your pediatrician may suggest scheduled awakenings) or come with other symptoms like snoring or pauses in breathing, which can point to a separate sleep problem.
- Night terrors or nightmares persist well into the older school years or teens, or start for the first time in an older child or adult.
- Daytime anxiety, a recent trauma, or your gut tells you something more is going on.
As the AAP puts it, when in doubt, don't hesitate to talk with your pediatrician — that conversation is exactly what they're there for.
The bottom line
Nightmares and night terrors feel like the same emergency from the hallway, but they're opposites: a nightmare is a REM dream late in the night, and your child wakes, remembers, and needs your comfort — so go to them. A night terror is a partial arousal from deep sleep early in the night, and your child isn't really awake and won't remember — so keep them safe and let it pass without waking them. Both are common and usually outgrown, both are worsened by overtiredness, and everyday bedtime fears respond to calm routines and gentle reassurance rather than monster spray. Knowing which is which turns a terrifying moment into a manageable one — and lets you save your own racing heart for things that actually warrant it.
This article is educational and not medical advice. Always check with your pediatrician/provider.