A split night is when your baby or toddler wakes in the middle of the night and stays awake for an hour or more, often happily: chatting, babbling, standing in the crib or wanting to play, then eventually drifting back to sleep. In a child who is otherwise well, it usually means their sleep over 24 hours is out of balance. The common causes are too much daytime sleep for their age, a bedtime that's too early, too short a stretch awake before bed, and night wakings that have become playtime.
The American Academy of Sleep Medicine (AASM) recommends 12–16 hours of sleep in 24 hours for babies aged 4–12 months, 11–14 hours for 1–2 years and 10–13 hours for 3–5 years, including naps. Adding up your child's sleep against those ranges is the first step. The fixes are usually simple: trim or move naps, adjust bedtime, hold the morning wake-up steady, and keep night wakings dark and dull.
What does a split night look like?
Health services don't use the term "split night", but parents describe the same pattern:
- Your child goes to bed and sleeps well for the first part of the night.
- They wake somewhere in the middle of the night and are wide awake for an hour or more.
- They seem content, not hungry, scared or in pain, and may chat, sing, play or stand up.
- They fall asleep again eventually, and may then sleep in or nap longer the next day, which keeps the cycle going.
It's different from a false start, which happens soon after bedtime, from early morning waking, where your child starts the day too early, and from ordinary night wakings, where your child needs a feed or comfort and settles fairly quickly. A child who is upset, hard to comfort or unwell during a long waking is a different situation; see the help section below.
Why do split nights happen?
Most children only sleep a certain amount in 24 hours. If more of it happens in the day, or the night is longer than they can fill, there's a gap somewhere, and in a split night it shows up in the middle.
There's research behind this idea in toddlers. A 2016 study by Nakagawa and colleagues tracked 50 healthy toddlers aged about 1.5 for 7 days with movement monitors and sleep diaries. Longer naps and later nap end times were linked with shorter night sleep and later sleep onset, while total sleep over 24 hours stayed about the same. That suggests naps moved sleep from night to day rather than adding to it. The study didn't find a link between naps and time awake in the night, and it was small and observational, so it supports the idea rather than proving it.
Too much daytime sleep for their age
The Children's Hospital of Philadelphia (CHOP) gives average daytime sleep falling from about 4 hours at 6 months to 3 hours at 9–12 months, 2.5 hours at 18 months and 2 hours at 2 years, while night sleep settles at about 11 hours. A child who naps well above those averages, especially one who is still on two long naps, may simply not need as much sleep overnight. KidsHealth says babies aged 8–12 months usually take two naps of anywhere from about 30 minutes to 2 hours.
A bedtime that's too early
A Royal Children's Hospital Melbourne sleep review in Australia describes night sleep for 7–12-month-olds running from between 6 pm and 10 pm until 5 am or later, and notes that each baby has their own "night" hours. If your child goes to bed at the early end and you also expect a late wake-up, the night may be longer than they can sleep. Cleveland Clinic lists going to bed too early as a cause of early waking, and the same gap can appear mid-night instead.
Too little awake time before bed
A nap that ends close to bedtime leaves less time to get tired. The Better Health Channel in Victoria, Australia, says an afternoon nap too close to bedtime can severely disrupt the night routine. KidsHealth on naps suggests regular nap times for toddlers that fall well before bedtime, and Sleep Foundation suggests a 2-year-old's nap end at least 3 to 4.5 hours before bed.
Night-time play has become a habit
If a waking ends up with lights on, chatting, a show or time in the living room, the night becomes interesting. KidsHealth says cuddling, feeding or talking when your baby wakes may prompt them to wake regularly for that attention, and its toddler sleep guide says too much interaction during night checks can backfire.
Other things that can play a part
The NHS guide to helping your baby sleep says growth spurts, teething and illness can all affect how babies sleep, and CHOP notes that sleep problems can be a sign of illness, so check with your doctor or pediatrician if a new pattern develops. New skills such as pulling up and standing often unsettle sleep for a while too; see sleep regression ages.
How much sleep does my child need in 24 hours?
Total sleep comes from the AASM, which the AAP supports. Daytime averages come from CHOP. These numbers match the baby sleep schedule by age guide.
| Age | Total sleep per 24 h (AASM) | Average daytime sleep (CHOP) |
|---|---|---|
| 6 months | 12–16 h | 4 h |
| 9–12 months | 12–16 h | 3 h |
| 18 months | 11–14 h | 2.5 h |
| 2 years | 11–14 h | 2 h |
| 3 years | 10–13 h | Not listed |
The NHS gives similar figures: some babies aged 6–12 months sleep around 15 hours, most of it at night, and children sleep around 12 to 15 hours in total after their first birthday. CHOP doesn't give a figure for 3-year-olds, and KidsHealth says many preschoolers give up their afternoon nap between 3 and 5.
The ranges are wide, and your child doesn't need to hit a particular number. What helps is the pattern. If a week's average sits near the top of the range, naps are well above the CHOP average and your child is awake for long, happy stretches at night, there's probably room to move sleep from the day back into the night.
How to add it up
- For a week, write down bedtime, when your child fell asleep, when the night waking started and ended, the morning wake-up, and each nap.
- Each day, add the night sleep (minus the time awake) to the nap time.
- Average the week, then compare it with the range above and with the daytime averages.
How do I fix split nights, step by step?
Change one thing at a time, so you can tell what helped.
- Hold the morning steady. Wake your child at the usual time even after a split night, rather than letting them sleep in. The AAP suggests the same wake-up time on weekdays and weekends, and bright light when it's time to wake up.
- Trim or move the nap that's most out of line. Shorten the longest nap a little, or wake your child earlier from the last nap so there's a longer stretch before bed. Go in small steps: Nationwide Children's Hospital warns that cutting back naps to encourage night sleep can cause overtiredness and a worse night.
- Adjust bedtime. If your child is relaxed and not tired at bedtime, move it later in small steps; Cleveland Clinic suggests about 10 minutes a night. If they're melting down at bedtime, a later bedtime is unlikely to help; look at whether naps are short or broken instead, and see overtired baby.
- Keep night wakings dark and dull. The NHS advice on sleep and young children suggests being as boring as possible when your child wakes in the night and leaving the lights off. The AAP suggests not stimulating babies at night and speaking softly if you speak at all.
- Keep them in their crib. Brief, calm check-ins are fine. Taking your child out to play, watch a screen or come into the living room makes the waking worth staying awake for.
- Feed a hungry baby. If your baby is genuinely hungry, feed them quietly in the dark, then back to the crib. See dropping night feeds when you're ready to work on night feeds.
- Watch the nap transition. A long midday gap may mean your child is ready for fewer naps; see naps and nap transitions and two naps to one.
Keep the crib safe while your child is awake in it. For babies under 12 months, Australia's Red Nose's six safe sleep recommendations in Australia include placing your baby on their back, keeping their head and face uncovered and a safe sleeping environment night and day, so no toys or soft items in the crib. For toddlers who stand, KidsHealth suggests checking for curtains, blind cords, pictures or wall hangings within reach.
Example adjustments
Example adjustments — adjust to your child. These are made-up examples built from the averages above, not targets.
| Example child | What a week's log shows | One change to try first |
|---|---|---|
| 9 months | Naps about 4 h in total; in bed 6 pm to 6:30 am; awake about 2 h most nights | Shorten the longer nap a little; keep the 6:30 am start |
| 15 months | Two naps, the second ends at 5 pm; bed at 7 pm | End the second nap earlier, or see if one nap suits |
| 2 years | Nap of nearly 3 h ending at 4 pm; bed at 6:30 pm | Wake from the nap earlier so it ends 3 to 4.5 h before bed |
| Any age | Wakings include lights, chatting and play | Lights off, voice low, back to the crib |
In the 9-month example, 4 hours of naps is above CHOP's 3-hour average for that age, and 12.5 hours in the crib is well over the 11-hour average night CHOP gives, so a gap in the middle is likely.
How long does it take to fix a split night?
A few days to a few weeks. The RCH review says it can take anywhere from 3–14 days to change a sleep pattern, and Cleveland Clinic says changing a bedtime and wake time can take about three weeks, with consistency essential. Give each change at least a week before adding another, and judge it on the week's pattern rather than single nights. You may see a few tired afternoons while the day rebalances; an occasional earlier bedtime on a rough day is fine.
Should I drop the nap altogether?
Usually not, especially for younger toddlers. The Better Health Channel says children still need a daytime nap, or two, until around 2.5 to 3 years, and Nationwide Children's warns that cutting naps can make nights worse. If your child is closer to 3, is fighting the nap most days and is still awake for long stretches at night, they may be ready to stop. KidsHealth suggests an earlier bedtime when a child gives up their nap. See dropping the nap.
When should I talk to a doctor or pediatrician?
These tiers follow the NHS guide to urgent medical help for under-5s and the AAP.
Call 911 now if your child:
- is struggling to breathe, breathing very fast, grunting or sucking in at the tummy or ribs
- stops breathing for more than 20 seconds, or turns pale, blue or gray, as the AAP sleep apnoea guide warns
- is floppy, much sleepier than usual, hard to wake or can't be woken
- has a weak, high-pitched or continuous cry, or is having a seizure
Get medical help today (a same-day doctor or your pediatrician's after-hours nurse line) if your child seems unwell, is feeding or drinking much less than usual, or has fewer wet diapers than usual.
Talk to your doctor or pediatrician soon if your child snores loudly or snores most nights, or snorts, gasps or pauses in their sleep. The AAP says to tell your doctor right away about frequent snoring. Australia's Sydney Children's Hospitals Network lists snoring often, pausing or gasping for air, restless sleep and daytime tiredness as signs of obstructive sleep apnoea, and names large tonsils or adenoids among the causes.
Mention it at your next check if split nights carry on after a few weeks of consistent changes, your child seems very tired during the day, or the broken nights are wearing you down. your pediatrician's office can help you plan. If you have thoughts of harming yourself or your child, call 988 (call or text) or 911 now.
What's worth noting in a sleep log?
Note when each nap starts and ends, bedtime, when the night waking begins and ends, and the morning wake-up. Adding up the totals over a week usually shows where the extra sleep is, often a long or late nap. The log also gives your doctor or pediatrician a clear picture if you ask for help.