Wake window calculator
How long can your baby happily stay awake? Enter their age (or birthdate) and get the recommended wake window — and if you tell us when they last woke up, the exact time window for the next nap.
Recommended awake time
1 h 30 min – 2 h 30 min
Next sleep window
General guidance for healthy babies — every child is different. This is not medical advice; talk to your pediatrician about your baby.
What is a wake window?
A wake window is the stretch of time a baby can comfortably stay awake between sleeps. Keep it too short and they’re not tired enough to fall asleep; stretch it too long and they tip into overtiredness — which, unfairly, makes falling and staying asleep harder.
Wake windows grow fast in the first two years: a newborn manages about 45–60 minutes, a 6-month-old 2–3 hours, and an 18-month-old 5–6 hours. This calculator interpolates between ages, so a 7-month-old gets a slightly longer window than a 6-month-old — the same continuous curve the Nana app uses.
How to use the result
Treat the range as your aiming zone, not a stopwatch: start winding down toward the lower end on busy, stimulating days and toward the upper end on calm ones. Watch for sleepy cues — rubbing eyes, zoning out, fussiness — and act on the first ones you see.
The last wake window of the day (before bedtime) is usually the longest one, and the first of the morning the shortest.
Frequently asked questions
What happens if my baby stays awake past the wake window?
Occasionally, nothing — babies are resilient. Consistently overshooting leads to overtiredness: cortisol rises, falling asleep gets harder, naps shorten and nights fragment. If you missed the window, aim for an earlier next nap or an earlier bedtime.
Are wake windows the same for every baby?
No — these ranges fit most healthy babies, but your baby may run 15–30 minutes shorter or longer. Track a few days and adjust toward whatever produces easy settling and decent naps. That personal calibration is exactly what the Nana app automates.
Do wake windows apply at night?
No. Wake windows guide daytime awake stretches. At night, keep interactions dark, boring and brief so night wakings don’t turn into awake time.
Want this calculated automatically, every day?
Nana learns your baby's real rhythm and adjusts nap times and bedtime as the day actually unfolds — not just by age. Free to start.