Why Won’t My Baby Sleep at Night? Day–Night Confusion and Newborn Sleep

Updated 2026-11-02 · Reviewed against the sources listed below

Many newborns seem to have their days and nights mixed up: sleepy and calm all afternoon, wide awake at 2 a.m. It is exhausting, but it is also expected. Here is why it happens and what helps.

How much do babies really sleep?

An expert panel from the National Sleep Foundation recommends 14 to 17 hours of sleep in 24 hours for newborns (0 to 3 months) and 12 to 15 hours for infants (4 to 11 months) ^[1]. A large review of studies found healthy infants averaged about 12.8 hours, with a wide normal range ^[2]. The catch: in the early weeks, that sleep comes in short pieces spread across the day and night.

Why nights are hard at first

Before birth, your baby lived in steady darkness, rocked by your movement during the day and calmer when you rested. After birth, their body clock (circadian rhythm) has to learn a new day–night pattern, and it develops gradually over the first months of life ^[3]. Until it does, babies simply sleep when they are tired and wake when they are hungry, whatever the hour.

How to help your baby learn day from night

• Bright, lively days. Open the curtains, take walks, talk and play during daytime feeds.
• Dark, quiet nights. Keep night feeds dim and calm. Bright evening light can strongly suppress the sleep hormone melatonin in young children ^[4].
• A repeatable bedtime routine: bath or wipe-down, pajamas, feed, song, lights out ^[5].
• The same calming sound each night, so it becomes a signal that it is time to sleep.

A sound that feels like home

For newborns, many parents start with womb sounds: a deep, muffled whoosh and a calm heartbeat, close to what your baby heard for months before birth. The picture fades to black after a minute, so the nursery stays dark.

When to talk to your pediatrician

Call your pediatrician if your baby is hard to wake for feeds, is not gaining weight, has a fever, or if crying seems unusual for them. And if you are struggling with exhaustion, say so. It is a real health issue for parents, too.

Questions

References

1. Hirshkowitz M, Whiton K, Albert SM, et al. National Sleep Foundation’s sleep time duration recommendations: methodology and results summary. Sleep Health. 2015;1(1):40–43. Link
2. Galland BC, Taylor BJ, Elder DE, Herbison P. Normal sleep patterns in infants and children: a systematic review of observational studies. Sleep Medicine Reviews. 2012;16(3):213–222. Link
3. Rivkees SA. Developing circadian rhythmicity in infants. Pediatrics. 2003;112(2):373–381. Link
4. Akacem LD, Wright KP, LeBourgeois MK. Sensitivity of the circadian system to evening bright light in preschool-age children. Physiological Reports. 2018;6(5):e13617. Link
5. Mindell JA, Williamson AA. Benefits of a bedtime routine in young children: sleep, development, and beyond. Sleep Medicine Reviews. 2018;40:93–108. Link
6. Henderson JMT, France KG, Owens JL, Blampied NM. Sleeping through the night: the consolidation of self-regulated sleep across the first year of life. Pediatrics. 2010;126(5):e1081–e1087. Link

This article summarizes published research for general information. It is not medical advice. Talk to your pediatrician about your baby’s sleep, feeding and crying.