Baby Cries in Their Sleep: Is It Normal? What You Need to Know

In many cases, when a Baby Cries in Their Sleep, it is a normal part of infant sleep cycles. Babies often make noises, whimper, or briefly cry as they move between sleep stages, and these moments can happen without the baby fully waking. Still, sleep crying can also happen for other reasons such as hunger, digestive discomfort, developmental changes, or shifting sleep patterns.

We recognize that if your baby cries in their sleep, it can be confusing and unsettling. And that many parents instinctively wonder whether something is wrong or whether they should wake their baby up to help.

That’s why this guide is designed to help parents better understand what’s happening — and decide when to simply wait and when to step in to soothe their baby.

Is It Normal for Babies to Cry in Their Sleep?

Yes. Many babies cry or fuss briefly while sleeping, especially during the first year.

Infant sleep looks very different from adult sleep. Babies spend a large portion of their sleep in a stage often called active sleep, which is similar to the rapid eye movement (REM) stage seen in older children and adults ¹. During this stage, babies may move their arms or legs, make facial expressions, whimper, or even cry out briefly.

Because babies cycle between sleep stages more frequently than adults, they may make noises or vocalize several times during the night without actually waking up ². In many cases, these sounds pass quickly and the baby settles back into deeper sleep on their own.

For parents listening through a baby monitor, these moments can sound dramatic. But brief baby cries in their sleep is often simply part of how babies transition between sleep cycles.

Common Reasons Babies Cry While Sleeping

While active sleep is the most common explanation, there are several reasons a baby might cry during sleep.

Active Sleep

During active sleep, babies often move, twitch, grunt, or cry briefly ³. Their breathing may become irregular and their eyelids may flutter.

Because babies spend a significant portion of their sleep in this stage—especially during the newborn months—it is common for them to make noises that sound like distress even when they remain asleep.

In many cases, the best response is simply to pause and observe for a moment. Babies often settle back into quiet sleep without intervention.

Hunger or Feeding Transitions

For younger babies, baby cries in their sleep may signal that they are beginning to wake due to hunger.

Newborns and young infants wake frequently to feed because their stomachs are small and their bodies are growing rapidly. Sometimes the first signs of waking are small cries or fussing sounds before the baby becomes fully alert.

If the crying continues and the baby wakes fully, feeding may help them return to sleep.

Sleep Cycle Transitions

Babies have shorter sleep cycles than adults, often lasting around 40–50 minutes ⁴.

When babies move between these cycles, they may briefly stir, cry out, or fuss. Some babies quickly settle themselves back to sleep, while others need help transitioning.

As babies grow and their sleep patterns mature, many learn to move between cycles more smoothly.

Gas or Digestive Discomfort

Digestive discomfort can sometimes cause babies to cry during sleep. Gas, mild reflux, or a full stomach after a feeding may lead to brief restlessness.

In these cases, babies may squirm, pull their legs up, or cry more persistently before waking.

Ensuring babies have time to burp after feedings and maintaining comfortable sleep positioning can sometimes reduce nighttime discomfort.

Teething (in Older Infants)

Teething typically begins later in infancy, but when it does, many parents report changes in sleep. However, recent research using objective sleep measurements found no significant differences in sleep metrics between teething and non-teething nights ⁶.

Teething discomfort tends to come and go, and some babies are more sensitive to it than others. If your baby is around six months and sleep feels more unsettled than usual, it may also be worth reviewing what’s typical for that age in our 6 month old sleep schedule guide.

Developmental Changes and Sleep Regressions

Periods of rapid development can temporarily disrupt sleep. During these phases, babies may cry more easily between sleep cycles or wake more frequently ⁵.

One of the most well-known examples is the four-month sleep regression, when babies’ sleep patterns begin to mature and resemble more adult-like cycles ⁵.

While these changes can lead to more nighttime disruptions, they are typically temporary.

How to Tell the Difference Between Active Sleep and Real Distress

One of the most helpful skills parents develop over time is learning to distinguish between sleep noises and true waking cries.

Active sleep vs true distress comparison

Sign	Active Sleep	True Distress
Crying	Brief whimpers or small cries	Crying becomes louder or more intense
Wakefulness	Baby remains asleep	Baby wakes fully
Duration	Crying stops quickly	Crying continues or escalates
Body language	Body remains relatively relaxed	Baby appears tense or uncomfortable

If a baby cries in their sleep briefly but remains asleep, it is often best to wait a moment before intervening. Many babies settle on their own once they move into the next sleep stage.

What Parents Should Do If Their Baby Cries in Their Sleep

When a baby cries in their sleep, it can help to pause for a moment before rushing in. Brief crying often resolves on its own if the baby is transitioning between sleep cycles.

If the crying grows louder, lasts longer, or the baby wakes fully, it may be a sign they need help settling. At that point, parents can respond in the way they normally soothe their baby—such as feeding, rocking, or offering gentle reassurance.

Over time, parents become familiar with their baby’s sleep sounds and patterns. What initially feels alarming often becomes easier to interpret with experience.

When Crying During Sleep Might Signal Something Else

Most sleep crying is harmless, but persistent or unusual patterns can occasionally signal that something else is happening.

Parents may want to look more closely if crying during sleep is accompanied by:

• signs of illness such as fever or vomiting
• breathing difficulties
• persistent screaming that does not settle
• significant changes in feeding or alertness.

If any of these occur, checking with a pediatrician can help rule out medical concerns.

When to Check With Your Pediatrician

If sleep crying is frequent, intense, or accompanied by other symptoms, it may be helpful to speak with your pediatrician.

They can help evaluate whether factors such as reflux, allergies, illness, or other conditions could be affecting sleep. In many cases, however, sleep crying turns out to be a normal part of infant sleep development.

Parents should always trust their instincts if something feels unusual or concerning.

Frequently Asked Questions