15-month-old wake windows
At fifteen months, a one-nap rhythm may fit increasingly well, while two-nap recovery days can still be useful.
| Typical starting point | Guidance |
|---|---|
| First wake window | 3h15–4h |
| Later/final wake window | 4h45–5h30 on one-nap days |
| Likely rhythm | Often 1 nap, sometimes 2 |
Example, not a fixed schedule
The actual day depends on the morning wake time, how naps unfold and whether the baby is transitioning between rhythms. Use ranges flexibly and avoid forcing sleep solely because a clock time has arrived.
How long should the nap be?
Nap duration varies by nap and by child. Lulla gives a flexible suggested range inside the calculator rather than one compulsory duration. A late bridging nap is usually shorter than a main midday nap.
Calculate the next sleep
Use the free browser calculator to enter the baby’s current awake time and compare likely rhythms.
Calculate for 15 months