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Your baby wakes at 1 or 2 am, but instead of crying for a feed and going back down, they are wide awake, babbling and ready to play. An hour goes by, sometimes two. That is a split night.
A split night is different from a normal night waking. The baby is not upset, and nothing seems wrong. They just do not have enough sleep pressure left to go back to sleep.
Why split nights happen
Sleep has two engines: the body clock (which makes nighttime sleepy) and sleep pressure (which builds the longer we are awake). A split night usually means the 24-hour total does not add up:
- Too much day sleep for their age. If naps take a bigger share, there is less sleep left for the night.
- Bedtime is too early. A very early bedtime can mean the night’s sleep “runs out” before morning.
- Not enough awake time before bed. A late or long last nap leaves too little sleep pressure.
- Ready for a nap transition. Split nights often show up when a baby is getting ready to drop a nap.
- Habit after a disruption such as illness, travel or a time-zone change.
How to fix a split night
- Add up 24 hours of sleep. Compare with what is typical for their age (for example, 12 to 16 hours at 4 to 12 months, including naps). If your baby is at the top of the range during the day and short at night, day sleep is the lever.
- Cap daytime sleep. Shorten the longest nap by 15 to 30 minutes, or wake from the last nap a bit earlier.
- Stretch the last wake window by 15 minutes every few days.
- Look at the age’s typical nap count. If your baby is near a transition, see nap transitions.
- Keep the night boring. Low light, no play, little talking. Respond calmly but do not turn it into a party.
- Anchor the morning. Start the day at the same time even after a rough night, so the body clock stays on track.
Our sleep schedule maker gives you a sample day of naps and bedtime for your baby’s age and wake-up time.
When to check with your pediatrician
Split nights are a schedule issue in most babies. If wakings come with snoring and pauses in breathing, signs of pain, reflux symptoms or poor feeding, talk to your pediatrician.