Newborn restlessness at night is almost always normal. Newborns spend a large portion of their sleep in “active sleep,” a light sleep stage where they grunt, squirm, flail their arms, and make faces. This can look alarming, but it’s a healthy part of how infant brains develop. Understanding why it happens, and knowing the few signs that aren’t normal, can help you sleep a little easier yourself.
Active Sleep Takes Up Half the Night
Adult sleep is mostly deep and still, which is why a newborn’s sleep looks so different by comparison. Newborns cycle between two types of sleep: active sleep and quiet sleep. During active sleep, babies move around, make noises, twitch, and breathe irregularly. They wake easily during these periods. During quiet sleep, they’re still, their breathing is deep and regular, and they’re harder to rouse.
Each sleep cycle lasts about 40 minutes and contains both types. Between cycles, newborns often wake briefly, sometimes fully. That means every 40 minutes or so, your baby may stir, fuss, or cry before settling into the next cycle. Many parents mistake active sleep for wakefulness and pick the baby up, which can actually interrupt sleep that was about to continue on its own. If your baby is squirming but their eyes are closed, give them a minute before intervening.
Their Body Clock Doesn’t Exist Yet
Newborns have no internal sense of day versus night. The circadian rhythm, the biological clock that makes adults sleepy when it’s dark, develops gradually over the first few months. Babies don’t begin producing meaningful amounts of melatonin (the hormone that signals nighttime) until around 6 to 7 weeks of age. A mature sleep rhythm doesn’t take hold until roughly 8 weeks.
Until that clock kicks in, your newborn’s sleep is scattered evenly across 24 hours. Nighttime restlessness isn’t your baby fighting sleep. They simply don’t recognize night as a time for longer, consolidated rest. Exposing them to natural daylight during the day and keeping nighttime feeds dim and quiet can help this rhythm develop, but it takes time regardless of what you do.
A Tiny Stomach Means Frequent Hunger
At birth, a baby’s stomach holds about 1 to 2 teaspoons. By day 10, it’s grown to roughly the size of a ping-pong ball, holding about 2 ounces. That small capacity means newborns digest a feeding quickly and genuinely need to eat every 2 to 3 hours, including overnight. Much of what looks like nighttime restlessness is simply hunger building before the baby fully wakes to cry for a feeding.
Hunger cues in newborns are easy to miss because they overlap with other signals. Rooting, lip-smacking, hand-sucking, and general fussiness can all mean hunger, but they can also mean discomfort, tiredness, or a need to be held. If your baby last ate more than two hours ago and is stirring, hunger is usually the safest bet.
The Moro Reflex Startles Them Awake
Newborns are born with a startle reflex called the Moro reflex. When they feel a sudden sensation, like being set down, hearing a noise, or even their own twitching during active sleep, their arms fling outward and then pull back in. This jolt frequently wakes them up, sometimes several times an hour.
The Moro reflex is strongest in the first few weeks and gradually fades by around 6 months. Swaddling (with arms snug, hips loose) is one of the most effective ways to reduce how often the reflex disrupts sleep, because it keeps the arms contained. If your baby still shows the Moro reflex after 6 months, mention it to your pediatrician.
Evening Overstimulation and the “Witching Hour”
Many newborns have a predictable fussy period each day, most commonly in the evening and first part of the night. This fussiness tends to build over the first several weeks of life, peaking around 6 to 8 weeks. During these stretches, babies may cry intensely, resist settling, and seem inconsolable even when held.
One explanation is sensory overload. A newborn’s brain doubles in size during the first year, and every day brings a flood of new information. By evening, all that stimulation accumulates, and the baby essentially needs time to decompress but lacks the ability to self-soothe. In busier households where other family members return in the evening, the extra noise and activity can make this worse. Dimming the lights, reducing noise, and offering skin-to-skin contact in the hour before you want the baby to sleep can help shorten these fussy stretches.
Digestive Struggles That Look Like Pain
Newborns frequently grunt, strain, turn red in the face, and squirm at night while working through digestion. One common and often misunderstood cause is infant dyschezia, a coordination problem where the baby hasn’t yet learned to relax the right muscles to pass a bowel movement. These babies may cry, kick, and strain for 10 to 30 minutes before finally pooping, and sometimes they don’t succeed at all on a given attempt.
It looks painful, but pediatricians believe the crying is actually functional: babies cry to generate the abdominal pressure they need to push the stool out, not because something hurts. The key distinction is what the poop looks like when it arrives. If it’s soft or pasty, the issue is coordination, not constipation. If stool is hard, pellet-like, or bloody, that points to actual constipation and is worth a call to your pediatrician. Dyschezia resolves on its own as the baby’s muscle coordination matures over the first few months.
Room Temperature and Sleep Environment
Babies are sensitive to temperature and can’t regulate their own body heat well. A room that’s too warm or too cool is a common, fixable cause of nighttime restlessness. The recommended range for a baby’s sleep space is 68 to 72°F (20 to 22°C). A good rule of thumb: dress the baby in one layer more than you’d wear comfortably in that room.
Signs that temperature is the problem include sweaty hair or neck (too warm) or cool hands and a fussy demeanor (too cold). Beyond temperature, the sleep surface itself matters for both safety and comfort. The American Academy of Pediatrics recommends placing babies on their backs in their own sleep space, on a firm, flat mattress with a fitted sheet and nothing else. No loose blankets, pillows, stuffed animals, or bumper pads. A bare, firm surface may look uncomfortable to adult eyes, but it’s what newborns sleep best and safest on.
Normal Breathing Versus Concerning Pauses
Newborn breathing during sleep can sound alarming. It’s common to hear irregular rhythms, brief pauses, snorts, and gurgles during active sleep. A pattern called periodic breathing, where the baby pauses for 5 to 10 seconds between short bursts of faster breathing, is normal and particularly common between 2 and 4 weeks of age. It typically resolves by 6 months.
What’s not normal is a breathing pause lasting 20 seconds or longer, or a shorter pause accompanied by a bluish color around the lips or face, limpness, or a significant drop in alertness. These are signs of apnea and need immediate medical attention. If your baby’s restlessness is accompanied by any color changes, extreme limpness, or pauses that make you count the seconds, that’s a different situation from the ordinary grunting and squirming of active sleep.
What Actually Helps
Most nighttime newborn restlessness resolves on its own as the baby’s brain, digestive system, and reflexes mature over the first 3 to 4 months. In the meantime, a few practical strategies make a noticeable difference:
- Swaddle snugly to dampen the Moro reflex, keeping hips loose enough for natural movement.
- Keep nighttime boring. Use dim light for feeds and diaper changes. Avoid talking, playing, or making eye contact more than necessary. This helps the circadian rhythm develop faster.
- Wait before responding. When you hear grunting or see movement, pause for 30 to 60 seconds. Your baby may be in active sleep and will settle without help.
- Check the room temperature. Aim for 68 to 72°F and adjust clothing layers accordingly.
- Wind down the evening. Reduce household noise and light in the hour before bedtime to ease the transition from overstimulation.
The first 8 weeks tend to be the most restless. Once melatonin production ramps up and sleep cycles begin to mature, most babies start consolidating longer stretches of nighttime sleep. It doesn’t happen on a schedule, and there will be regressions, but the biology is moving in the right direction.