When Do Babies Start Dreaming? Baby Dreams, Nightmares, and Night Wakings

Babies almost certainly experience something during sleep, because they spend far more of the night than adults in active sleep, the dream like stage of the brain. But whether newborns have true dreams with images and stories is unknown, and vivid nightmares do not usually appear until the toddler and preschool years.

If you have watched your sleeping baby smile, whimper, flutter their eyelids, or twitch and wondered what is going on behind those closed eyes, you are asking one of the oldest questions in parenting. It is a lovely question, and an honest answer means separating what we know from what we can only guess.

This guide walks through what active sleep is, when and whether babies dream, how nightmares and night terrors differ and when they start, and how all of this connects to the night wakings that keep so many families up.

Active Sleep: Why Babies Look So Busy Asleep

Newborns spend roughly half of their sleep in active sleep, the infant version of REM, compared with about a fifth to a quarter in adults. Classic developmental research showed this share is highest at birth and falls steadily through childhood as the brain matures.

In active sleep the brain is highly engaged. Breathing is irregular, the eyes move under the lids, and the body twitches, wriggles, smiles, and makes small noises. Researchers believe this stage supports rapid brain development, possibly helping the brain map the body and refine movement. So a baby who seems to be dreaming is at least in the right stage of sleep for it.

So Do Babies Actually Dream?

Here is the honest answer: nobody knows. Dreaming is a subjective, reported experience, and a baby cannot describe it. We can see that the brain stage associated with dreaming is very active in infancy, but active sleep does not prove that a baby is picturing anything.

Many sleep scientists suspect that if babies dream at all, early dreams are unlikely to be the narrative, story shaped dreams older children and adults describe, since those seem to depend on language, memory, and imagination that develop over the first few years. A reasonable view is that dreaming becomes more dream like as the mind that produces it grows up.

What this means for you at 2 a.m.: a smiling or fussing sleeper is showing normal active sleep, not necessarily a happy or bad dream. It is a beautiful mystery, and it is also nothing to worry about.

Nightmares Versus Night Terrors

These two get mixed up constantly, and they are quite different. A nightmare is a frightening dream that happens in REM sleep, usually in the second half of the night. The child wakes up, is genuinely scared, can often be comforted, and by preschool age may even describe what happened. Nightmares generally start in the toddler and early preschool years and are a normal part of a growing imagination.

A night terror is not a dream at all. It happens during deep non REM sleep, usually in the first few hours after bedtime. The child may sit up, scream, thrash, sweat, and look terrified with open eyes, yet they are not truly awake, are very hard to console, and remember nothing in the morning. Night terrors peak in the preschool and early school years. Our guide on night terrors in toddlers covers what to do in the moment.

For young babies, sudden crying in sleep is far more likely to be active sleep noise or a normal partial waking than a nightmare. See our guide on crying in sleep for the everyday version of this.

What Baby Night Wakings Usually Are

Most night wakings are not caused by dreams. Babies cycle through light and deep sleep across the night, and at the end of each cycle they surface briefly. A baby who has learned to resettle drifts back down. A baby who has not yet may cry out for help. This is biology, not a bad dream.

If wakings are frequent and you want to help your baby resettle more independently, a steady, predictable bedtime routine is one of the most evidence backed tools available, and our overview of common sleep training methods walks through gentle options.

When to Mention It to Your Pediatrician

Dreaming itself is not a medical issue, but talk with your pediatrician if sleep movements continue while your baby is fully awake, if episodes of screaming come with breathing trouble, color changes, or stiffening, if your child seems excessively sleepy or hard to rouse during the day, or if night fears become intense enough to disrupt daily life. For safe sleep at every age, keep the crib bare and put your baby down on their back, in line with AAP guidance.

Curious about your baby’s busy sleep? Our guides on twitching in sleep, grunting in sleep, and crying in sleep explain more of what you see and hear. For the big picture, visit our sleep schedule by age guide.

Frequently Asked Questions