Wake windows by age
How long your baby can comfortably stay awake between sleeps, from the newborn weeks to the toddler years, and why the timing matters.
| Age | Wake window | Naps / day | Daytime sleep |
|---|---|---|---|
| Newborn | 35–60 min | Many (often 6–8 sleeps) | Spread across the day |
| 1 month old | 45–75 min | 5–7 | 5–7 h |
| 2 month old | 60–90 min | 4–5 | 4–6 h |
| 3 month old | 75–120 min | 4–5 | 4–5 h |
| 4 month old | 1.5–2.25 h | 3–4 | 3–4.5 h |
| 5 month old | 2–2.5 h | 3 | 3–4 h |
| 6 month old | 2–3 h | 2–3 | 3–3.5 h |
| 7 month old | 2.25–3.25 h | 2–3 | 2.5–3.5 h |
| 8 month old | 2.5–3.5 h | 2 | 2.5–3 h |
| 9 month old | 3–3.5 h | 2 | 2–3 h |
| 10 month old | 3–3.75 h | 2 | 2–3 h |
| 11 month old | 3–4 h | 2 | 2–2.5 h |
| 12 month old | 3–5 h | 1–2 | 2–3 h |
| 15 month old | 3.5–5.5 h | 1–2 | 1.5–3 h |
| 18 month old | 4.5–6 h | 1 | 1.5–2.5 h |
| 2 year old | 5–6 h | 1 | 1–2 h |
| 2.5 year old | 5.25–6.5 h | 0–1 | 0–1.5 h |
Ranges compiled from common paediatric sleep guidance; see sources & method.
Why wake windows work
Sleep researchers describe sleep as the result of two forces, the two-process model first set out by Alexander Borbély in 1982. The first is sleep pressure: a chemical drive (partly the build-up of adenosine) that rises the longer anyone is awake and drains away during sleep. The second is the body clock, the roughly 24-hour circadian rhythm that pushes alertness up and down over the day.
Babies build sleep pressure fast, which is why a newborn is ready to sleep again after less than an hour. The body clock only starts working in earnest around 2–4 months, when babies begin making their own melatonin at night. From then on, days and nights separate and wake windows can stretch.
A wake window is simply a practical estimate of when pressure is high enough for easy sleep but not so high that your baby tips into overtiredness.
Try it: watch sleep pressure build
Pick an age, then drag the time awake. The shaded band is that age's typical wake window.
Pressure is building. Start the wind-down: dim the room, feed or change, quiet play.
Body clock: working — it pushes alertness up by day and lets sleep pressure win at night, which is why a longer stretch before bed is possible.
Using wake windows day to day
- Start short in the morning. The first window after a night's sleep is usually the shortest of the day.
- Count the wind-down. Begin the pre-nap routine 10–15 minutes before the window ends.
- Watch the baby, not only the clock. Yawning, rubbing eyes, staring off and sudden fussiness mean it's time, even if the timer says otherwise.
- Short nap? Shorter next window. After a 30-minute nap, offer the next sleep a little sooner.
A pre-nap stroller walk sometimes turns up a pale Moon in broad daylight, and a toddler asking why it’s out now; ahaboo has a narrated Moon explainer that makes the answer easy to share.
To turn these windows into a full day, use the schedule generator.
Wake window questions
What is a wake window?
A wake window is the stretch of time a baby is awake between one sleep and the next. It is measured from when the baby wakes up to when they fall asleep again.
Do wake windows include feeding time?
Yes. Everything between waking and falling asleep counts: feeds, diaper changes, play and the wind-down routine.
Are wake windows backed by research?
The ranges are practical guidance based on how sleep pressure builds and on typical nap patterns; they are not a medical standard. Treat them as a starting point alongside your baby's sleepy cues.
Why is the last wake window of the day the longest?
Once the body clock matures, it keeps babies alert through the late afternoon, then lets sleep pressure win in the evening. That is why most babies manage the longest stretch awake right before bedtime.