Wake Windows by Age

A wake window is how long your baby stays awake between sleeps. Getting it right makes a noticeable difference to how easily they settle and how long they nap. Too short and they're not tired enough. Too long and they become overtired, which makes everything harder.

This guide covers the recommended ranges from newborn through 18 months, how to read your baby's cues, and what to do when things aren't working.

Wake window ranges by age

Age	Wake window	Typical naps
0 to 6 weeks	45 to 75 minutes	4 to 6 naps
6 to 12 weeks	60 to 90 minutes	4 to 5 naps
3 to 4 months	75 to 120 minutes	3 to 4 naps
5 to 6 months	2 to 2.5 hours	3 naps
7 to 9 months	2.5 to 3.5 hours	2 naps
10 to 12 months	3 to 4 hours	2 naps
13 to 18 months	4 to 6 hours	1 to 2 naps

These are ranges, not targets. Your baby may sit at the lower or upper end depending on temperament, nap quality, and how active they are during awake time.

How to read tired cues

Numbers are a useful starting point, but your baby's behaviour tells you what they actually need. Watch for:

• Early cues: Staring into space, less engaged with play, quieter than usual, turning away from stimulation.
• Mid cues: Rubbing eyes, pulling ears, yawning, becoming fussy or clingy.
• Late cues: Arching back, crying, jerky movements, hard to soothe. At this point they're overtired.

Ideally, you want to start your nap routine when you see the early cues. If you consistently miss them and only catch the late cues, try shortening the wake window by 15 minutes.

The overtired trap

When babies stay awake too long, their bodies produce cortisol to keep them going. This stress hormone makes it harder to fall asleep and harder to stay asleep. The result is often a cycle of short naps and difficult settling that feeds on itself.

Signs your baby may be overtired:

• Takes more than 15 to 20 minutes to fall asleep
• Naps less than 30 to 40 minutes consistently
• Wakes up crying rather than calm
• Increasingly difficult to settle as the day goes on

If this sounds familiar, try reducing wake windows by 15 to 20 minutes for a few days. A well-rested baby falls asleep more easily and sleeps for longer.

Undertired signs

On the other side, if your baby isn't tired enough at nap time you'll see different patterns:

• Happy and alert at the time you're putting them down
• Playing in the cot instead of settling
• Taking 20+ minutes to fall asleep without crying
• Consistently waking after one sleep cycle (about 30 to 45 minutes) without seeming tired

In this case, try extending the wake window by 10 to 15 minutes.

Wake windows and nap transitions

When your baby is ready to drop a nap, wake windows naturally stretch. The transition can take a couple of weeks to stabilise.

4 to 3 naps (around 4 to 5 months): Wake windows extend to roughly 2 hours. The last nap of the day may become a short "bridge" nap to get through to bedtime.

3 to 2 naps (around 6 to 8 months): Wake windows increase to 2.5 to 3.5 hours. Many babies need a slightly shorter first window and a longer one before bed.

2 to 1 nap (around 13 to 18 months): This is the biggest jump. Your toddler goes from roughly 3 to 4 hour windows to managing 5 to 6 hours. Most children aren't ready for this transition until closer to 15 months, even if they start resisting the second nap at 12 months.

Common mistakes

Clock-watching instead of baby-watching. The table above is a guide, not a prescription. If your baby shows tired cues 20 minutes before the "recommended" time, put them down. If they're clearly happy and engaged at the upper limit, let them stay up a bit longer.

Keeping the same wake windows all day. Most babies tolerate a slightly shorter first window (they're still warming up) and a slightly longer last window before bed. The middle windows tend to be average.

Extending too quickly. Wake windows increase gradually as your baby grows. If naps suddenly stop working, check whether you've stretched things too far too fast.

Confusing a sleep regression with a schedule problem. If everything was working and suddenly isn't, a regression may be the cause rather than wrong wake windows. Wait a week before making schedule changes.

For a practical view of how wake windows translate into a real day, see our sample sleep schedules by age.

Frequently asked questions

What is a wake window?

The time your baby spends awake between one sleep period and the next. It starts when they wake and ends when they fall asleep again.

What happens if my baby stays awake too long?

They become overtired. Cortisol rises, making it harder to fall asleep and stay asleep. This often leads to short naps, difficult bedtimes, and more night waking.

How do I know if the wake window is right?

If your baby settles within about 15 minutes and naps for at least one full sleep cycle (around 45 minutes), you're likely in the right range. Frequent short naps or long settling times suggest adjustment is needed.

Should the last wake window before bed be longer?

Usually, yes. Most babies handle a slightly longer stretch before bedtime. This helps build enough sleep pressure for a solid first stretch of night sleep.