Wake window calculator
Enter when your baby was born and when they last woke up. The calculator shows the wake window for their age and roughly when the next nap is due.
Enter the date of birth to see the wake window here.
A guide, not a stopwatch: every baby is different. These are the same values the Snugl app uses.
A chart to save. The ranges are a guide, and your baby can sit a little above or below them.
| Age | Wake window | Naps per day |
|---|---|---|
| 0–6 weeks | 45–75 min | 5–6 |
| 7–12 weeks | 60–90 min | 4–5 |
| 3–4 months | 1.5–2 hours | 3–4 |
| 5–7 months | 2–2.5 hours | 3 |
| 8–10 months | 2.5–3.5 hours | 2 |
| 11–15 months | 3.5–4 hours | 1–2 |
| 16 months and up | 4–5 hours | 1 |
A wake window is the time between waking up and the next sleep. Too long, and your baby gets overtired and has a harder time falling asleep. Too short, and they aren't tired enough yet. Wake windows grow with age: from under an hour for newborns to several hours in the second year.
The wake window tells you roughly when it's time. Your baby shows you the exact moment. Ideally, put them down at the early cues.
Around 4 months and again between 8 and 10 months, sleep changes noticeably for many babies. Naps get shorter, nights get more restless, and the old wake window no longer fits. That's normal and usually passes within a few weeks.
In Snugl you log sleep with one tap. The app knows the wake window for your baby's age, learns from your entries and shows you when the next nap is likely due.
Snugl does the math for you, based on age and your own logs. Free for iPhone and Android.
