Toddler Nightmares: Why They Start and How to Help

Toddler nightmares are scary dreams that wake a child fully, usually in the second half of the night, and leave them frightened and wanting you. They are a normal part of growing up. The AAP says children may start having nightmares as young as 6 months and that they tend to peak between 3 and 12 years old, so the toddler years are when most families meet them for the first time. The right response at night is short: go in, comfort, say it was a dream, and help your child settle back to sleep. The longer conversation belongs to the next morning.

This entry covers ages 2 to 4 years, when a child has the words to say something scared them and can’t yet be sure a dream stays in the bed.

What a nightmare is

KidsHealth defines a nightmare as “a scary or upsetting dream that usually wakes a person up.” Like most dreams, nightmares happen in REM sleep, the stage when the brain is very active. KidsHealth explains that they “tend to happen during the second half of a night’s sleep, when REM periods are longer,” which is why the cry so often comes at 3 or 4 a.m. and not at 10 p.m.

Two things mark a nightmare from the outside:

Your child is awake. They know you, they reach for you, and comfort works.
They can usually tell you something about it. KidsHealth notes that a child “might not remember every detail, but can usually recall some of the images, characters, or situations, and the scary parts.”

A child who screams early in the night, looks through you and can’t be comforted is probably having a night terror, which calls for the opposite response. The comparison table is in our toddler night terrors entry.

Why nightmares show up in the toddler years

“No one knows exactly what causes nightmares,” KidsHealth says plainly. What the pediatric sources do describe is a set of conditions that make them more likely, and most of those conditions arrive between the second and fourth birthdays.

Imagination comes online. Pretend play, stories and invented characters all take off in this stretch. A mind that can picture a friendly bear can also picture an unfriendly one. KidsHealth singles out children “with a good imagination” as the ones most affected by scary stories and shows.
Dreams feel real. KidsHealth says that “by about preschool age, kids begin to understand that a nightmare is only a dream.” A two-year-old isn’t there yet. When they wake, the images “are still fresh and can seem real.”
The day gets processed at night. Dreams “seem to be one way kids process thoughts and feelings, and work through worries and concerns,” KidsHealth says. A nightmare often has “recognizable bits and pieces of the day’s events and experiences, but with a scary twist.”
Change and stress. KidsHealth lists “moving, attending a new school, the birth of a sibling, or family tensions” as events that “might also be reflected in unsettling dreams.” For a toddler, a new daycare room or a parent’s work trip can do the same job.
Something scary on a screen or in a book. For some children, “reading scary books or watching scary movies or TV shows just before bedtime can lead to nightmares.” At two, scary can mean a loud villain or an older sibling’s cartoon.

What to do at 2 a.m.

The AAP’s advice on nightmares is short: “If your child has a bad dream, the best response is to comfort them.” Its steps, with KidsHealth’s added detail, make a workable middle-of-the-night script.

Go to them and be calm. The AAP says to “assure them that you are there and will not let anything harm them.” Your steady voice does more than your words.
Name it. KidsHealth suggests something like: “You had a bad dream, but now you’re awake and everything is OK.” For a toddler without the word “dream”: “That was a picture in your sleep. It’s gone now.”
Accept the fear. Don’t argue that there was nothing to be scared of. KidsHealth advises showing “that you understand that your child feels afraid and it’s OK.”
Listen, briefly. The AAP says to encourage your child to tell you what happened. KidsHealth adds there is “no need to talk more than briefly about the nightmare in the wee hours.” One or two sentences from them is plenty.
Check the room if they ask. The AAP suggests seeing “if there is something that is scaring your child, like shadows,” and fixing it. Move the coat off the chair; close the closet door.
Leave a light if it helps. The AAP says to “allow them to keep a light on if it makes them feel better.” A dim amber plug-in such as the GE SleepLite gives enough glow to see the room without waking them further.
Settle them back in their own bed. A comfort object, a tuck-in, and then, in the AAP’s words, “once your child is ready, encourage them to go back to sleep.”

If the bad-dream call turns into a nightly request for company, look at our entry on fear of the dark, which covers bedtime fears that start before sleep.

Cross-reference When bad dreams have turned into broken nights Betteroo builds a sleep plan for children from newborn to age 6 around your child's bedtime, fears and night waking, with coaching when a stretch gets hard. Take the free 3-minute quiz →

The next-day talk

Daylight is when a bad dream shrinks. KidsHealth says talking about it, “maybe even drawing the dream,” in the daytime “can help scary images lose their power.”

Let your child bring it up. Many toddlers have forgotten by breakfast. If yours hasn’t, listen without adding details of your own.
Draw it or act it out. A scribble of “the big dog” on paper is smaller than the one from the night.
Give it a new ending. KidsHealth suggests a child “might enjoy thinking up a new (more satisfying) ending.” The dog was looking for its ball. The dog went home for dinner.

Setting up calmer nights

“Parents can’t prevent nightmares,” KidsHealth says, “but can help kids get a good night’s sleep.” Its list for bedtime:

a routine that helps children “slow down and feel safe and secure,” such as “a bath, a snuggle from you, reading, or some quiet talk about the pleasant events of the day” (ours is laid out in the toddler bedtime routine entry)
no “scary movies, TV shows, and stories before bed,” especially ones that have set off a nightmare before
no screens in the wind-down, and no caffeine, which KidsHealth notes is found in chocolate and sodas as well as tea

A baby sibling who cries out in sleep is a different case. Betteroo covers what is going on at that younger age.

When to call the pediatrician

For most children, KidsHealth says, nightmares “happen only now and then, are not cause for concern, and simply need a parent’s comfort and reassurance.” It advises talking to the doctor if your child’s nightmares:

happen more than once a week
often prevent your child from getting enough sleep
happen along with other emotional or behavioral troubles

Also raise it if the nightmares began after a frightening event such as an accident (KidsHealth notes they can be “part of a child’s reaction to trauma”), or if your child is afraid to go to bed at all. None of this is medical advice.

FAQ

At what age do toddler nightmares start?

The AAP says nightmares can begin as young as 6 months and tend to peak between 3 and 12 years old. Most parents first notice them between two and three, when a child can say that something scared them.

Why does my toddler have nightmares every night?

Frequent nightmares often follow stress, a change at home or something scary seen close to bedtime. KidsHealth advises talking to the doctor when nightmares happen more than once a week or keep a child from getting enough sleep.

Is it a nightmare or a night terror?

A child who wakes fully, knows you and wants comfort had a nightmare. A child who screams early in the night, doesn’t seem to see you and remembers nothing was likely having a night terror.