Turn these windows into clock times
At twelve months the awake stretches are three to four hours, and most babies still need two naps to fill a day that long — despite the widespread assumption that one year means one nap.
| Wake window | Length | Where it falls |
|---|---|---|
| Window 1 | 3 h | after morning wake-up |
| Window 2 | 3 h 15 min | between naps |
| Window 3 | 3 h 30 min | before bedtime |
The same day with clock times, naps and bedtime is on the 12 month old sleep schedule page.
If two naps no longer fit inside the day without pushing bedtime late, that is the beginning of the 2-to-1 transition rather than a broken schedule. It usually takes three to four weeks, and an early bedtime is the tool that gets you through it.
Roughly 3 to 4 hours between sleeps. The Tier-1 bracket for 12–17 months is 180–240 minutes.
No. The typical 2-to-1 transition is 13–18 months. One nap at twelve months is early, and usually means an earlier bedtime is needed to cover the gap.
Often the longest of the day, around 3.5 to 4 hours after the afternoon nap ends.
Tier 1 — evidence-based The ranges on this page are the consensus sleep totals and nap counts below. The phrase "wake window" itself is a Tier 2 practice-based heuristic: it does not appear in the pediatric sleep-medicine literature, so treat the window lengths as a starting estimate and let your baby's sleepy cues override them.