Wake window calculator
Enter your baby's age and when they last woke up to see the typical wake window for that age, and a suggested window for the next nap or bedtime.
What is a wake window?
A wake window is the stretch of time a baby can comfortably stay awake between sleep periods before becoming overtired. It naturally lengthens as babies grow. These ranges are general guidelines drawn from widely-cited averages — real babies vary, and this is not medical advice.
Frequently asked questions
What happens if I miss the wake window?
An overtired baby often becomes harder, not easier, to settle — many parents find watching sleepy cues alongside wake windows works best.
Do wake windows change with each nap?
Yes, wake windows are usually shortest after night sleep and gradually extend across the day for many babies.
Is this a substitute for pediatric advice?
No — it's a general guideline. Talk to your pediatrician about your baby's individual sleep needs.
Want to go further?
Explore our guides and other calculators.