Wake Windows by Age: Chart for 4 to 36 Months
By Paola Mendoza, Certified Pediatric Sleep Consultant (CPSM) · Last updated September 2026
Quick answer: A wake window is how long your baby can comfortably stay awake between sleeps. At 4 months it's about 1.5 to 2 hours, at 6 to 8 months 2 to 3 hours, at 9 to 12 months 3 to 4 hours, at 13 to 18 months 4 to 6 hours, and from 18 months to 3 years about 5 to 6 hours around one afternoon nap.
What is a wake window?
A wake window is the stretch of time from when your baby wakes up to when they fall asleep again, including feeds, play and the nap routine. Getting it right is often the difference between a baby who fights every nap and one who goes down in five minutes.
Too short, and your baby isn't tired enough to fall asleep. Too long, and they get overtired, which makes sleep harder, not easier.
Wake windows by age chart
Here is the age-by-age guide I use with families. Use it as a starting point, then adjust to your baby.
| Age | Wake window | Naps | Total day sleep |
|---|---|---|---|
| 4 months | 1.5 to 2 hours | 4 | 3.5 to 4.5 hours |
| 5 months | 2 to 2.5 hours | 3 to 4 | 3.5 to 4.5 hours |
| 6 to 8 months | 2 to 3 hours | 3, dropping to 2 | 3 to 3.5 hours |
| 9 to 12 months | 3 to 4 hours | 2 | 2.5 to 3 hours |
| 13 to 18 months | 4 to 6 hours | 2, dropping to 1 | 2 to 3 hours |
| 18 to 36 months | 5 to 6 hours | 1 | 1.5 to 2 hours |
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Send me the guide4 month old wake windows
Most 4 month olds do best with wake windows of 1.5 to 2 hours and 4 naps a day. A 4.5 month old can usually stretch to about 1.75 to 2.25 hours. This is also when the 4 month sleep regression hits, so watch the windows closely: overtiredness makes it worse.
5 month old wake windows
At 5 months, wake windows grow to about 2 to 2.5 hours, and most babies move from 4 naps to 3 or 4. Total day sleep stays around 3.5 to 4.5 hours.
6 to 8 month old wake windows
Between 6 and 8 months, plan for 2 to 3 hours awake and 3 naps, often dropping to 2 naps near 8 months. Total day sleep is around 3 to 3.5 hours.
9 to 12 month old wake windows
From 9 to 12 months, most babies handle 3 to 4 hours awake with 2 naps and 2.5 to 3 hours of total day sleep. Don't rush to one nap at the first sign of nap refusal around 12 months; it's usually temporary.
13 to 18 month old wake windows
Between 13 and 18 months, wake windows stretch to 4 to 6 hours, and most toddlers move from 2 naps to 1 somewhere between 14 and 18 months. Here's how to handle the 2 to 1 nap transition.
18 month to 3 year old wake windows
From 18 months to 3 years, toddlers do best with about 5 to 6 hours awake around one afternoon nap of 1.5 to 2 hours. Bedtime usually lands 5 to 5.5 hours after that nap ends.
Why is the last wake window of the day the longest?
The stretch between the final nap and bedtime is usually the longest window of the day, because sleep pressure builds as the day goes on. If you use the same wake window all day long, bedtime lands too early and you get a 5 a.m. wake-up. More on that in what time your baby should go to bed.
How do I know if a wake window is too short or too long?
Watch your baby against the clock, not instead of it. How your baby falls asleep tells you which way to adjust:
Window too short (undertired)
- Takes more than 20 minutes to fall asleep
- Chats, plays or rolls around in the crib
- Short 30-minute naps
- Early morning wake-ups
Window too long (overtired)
- Fusses, arches and fights sleep
- Cries hard at bedtime
- Wakes 45 minutes after bedtime
- Short naps and early wake-ups too
Want a schedule built for your baby, not a chart?
The Restful Nights Plan gives you a custom nap and wake window schedule, a night feeding plan and a bedtime script, a live call to walk through it, and 14 days of daily messaging with me.
See the Restful Nights PlanShould I follow wake windows exactly?
No. Wake windows are starting points, not rules. Move in 15-minute steps: add 15 minutes if your baby is undertired, take away 15 if they're overtired, and give each change 3 days before judging it.
If your baby's schedule looks right on paper but the nights still aren't working, the schedule usually isn't the whole story. Short naps and night wakings often come from how your baby falls asleep, not when. Start with why naps are only 30 minutes.
Wake windows FAQ
What is the wake window for a 4.5 month old?
Most 4.5 month olds do well with about 1.75 to 2.25 hours awake, with the last window before bedtime being the longest.
Do wake windows include feeding time?
Yes. The wake window starts when your baby wakes up and ends when they fall asleep, so feeds, play and the nap routine all count.
When do wake windows stop mattering?
Once your toddler is on one nap, usually between 14 and 18 months, a consistent clock-based schedule matters more than exact wake windows.
What if my baby won't nap even with the right wake window?
Then timing probably isn't the problem. Babies who need to be fed or rocked to sleep often fight naps no matter the window. See how to get your baby to sleep without cry-it-out.
Keep reading: Why Does My Baby Wake Up 45 Minutes After Bedtime?
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