Newborns sleep 16 to 17 hours out of every 24, and roughly half of that happens during the day. If it feels like your baby does nothing but sleep, that’s because sleeping is their primary activity right now. In most cases, a newborn who sleeps all day is perfectly healthy. The key is knowing how to tell the difference between normal newborn sleep and something that needs attention.
How Much Sleep Is Normal
A healthy newborn sleeps about 8 to 9 hours during the day and another 8 hours at night, broken into short stretches of 1 to 3 hours at a time. That adds up to roughly 16 hours of sleep per day, though some babies clock closer to 17. Because newborns haven’t developed a sense of day versus night yet, their sleep is spread almost evenly across the clock. This is why it can look like your baby is “sleeping all day” when they’re actually sleeping all the time, with brief windows of wakefulness scattered throughout.
About half of a newborn’s total sleep is spent in REM sleep, the lighter, more active stage where you might notice eye fluttering, twitching, or irregular breathing. This is a much higher proportion of REM than adults get, and it plays a role in the rapid brain development happening in those first weeks.
Growth Spurts Can Add Even More Sleep
If your baby suddenly seems to sleep even more than usual, a growth spurt may be the reason. Research published by the American Academy of Sleep Medicine found that infants experience irregular bursts of sleep, with total daily sleep jumping by an average of 4.5 extra hours for about two days at a time. During these bursts, babies also took about three additional naps per day.
These sleep surges were directly linked to physical growth. Measurable increases in body length tended to occur within 48 hours of the extra sleep. Each additional hour of sleep raised the probability of a growth spurt by 20 percent, and each extra nap raised it by 43 percent. So if your two-week-old or six-week-old suddenly becomes even sleepier than usual for a day or two, their body is likely doing exactly what it needs to do.
When to Wake Your Baby to Eat
Even though newborns need a lot of sleep, they also need frequent feeding to support their rapid growth. In the first weeks of life, babies should eat every 2 to 4 hours. That means you may need to wake your baby if they’ve been sleeping longer than that stretch, especially in the first few weeks before they’ve regained their birth weight.
Waking a deeply sleeping newborn can feel counterintuitive, but nutrition takes priority at this age. Try changing their diaper, undressing them to their onesie, or gently stroking their feet and back. Once your baby is consistently gaining weight and your pediatrician gives the green light, you can generally let them sleep longer stretches without waking them to feed.
A good way to track whether your baby is getting enough milk is by counting wet diapers. After day five of life, you should see at least six wet diapers in a 24-hour period. Fewer than that can signal dehydration, which itself can make a baby sleepier and harder to feed.
Jaundice and Sleepiness
Jaundice is one of the most common medical reasons a newborn sleeps more than expected. It happens when a pigment called bilirubin builds up in the blood, giving the skin and eyes a yellowish tint. Mild jaundice is extremely common and usually resolves on its own, but higher levels of bilirubin can make a baby noticeably drowsier, harder to wake, and less interested in feeding.
This creates a cycle that can worsen the problem: a sleepy baby feeds less, and feeding less means the body clears bilirubin more slowly. If your baby has visible yellowing of the skin or whites of the eyes and is difficult to rouse for feedings, that combination warrants a call to your pediatrician. In rare cases, very high bilirubin levels can affect the brain, causing extreme listlessness, a high-pitched cry, and poor sucking.
Normal Sleepiness vs. Lethargy
This is the distinction that matters most. A normal newborn is sleepy but, when awake, looks alert, responds to your voice and touch, feeds well, and can be comforted when crying. A lethargic baby is something different entirely. Lethargic newborns appear to have little or no energy, are sluggish even when you try to engage them, and may be very difficult to wake for feedings. When they are awake, they don’t respond normally to sounds or visual stimulation.
Lethargy in a newborn can be a sign of infection, low blood sugar, or other conditions that need prompt medical evaluation. The easiest way to gauge where your baby falls: pay attention to their awake periods. If those windows, however brief, involve active movement, good feeding, and normal responsiveness, the amount of sleep is almost certainly fine. If your baby seems “floppy,” unresponsive, or impossible to wake, that’s a different situation.
One clear-cut emergency sign: a rectal temperature above 100.4°F (38°C) in any baby younger than 2 months. A fever at this age combined with excessive sleepiness requires an immediate trip to the emergency department.
Keeping Your Baby Safe During Sleep
Since your newborn spends most of the day asleep, the sleep environment matters enormously. Place your baby on their back for every sleep, including naps. Use a firm, flat mattress in a safety-approved crib or bassinet with only a fitted sheet. Keep blankets, pillows, bumper pads, and stuffed animals out of the sleep area entirely.
Keep your baby’s crib or bassinet in the same room where you sleep for at least the first six months. Room-sharing makes it easier to monitor your baby during those long stretches of sleep and simplifies nighttime feedings, which helps ensure your baby doesn’t go too long without eating in those early weeks.