Enter your baby's age to see the reference range for how long they can stay awake before needing sleep again, which helps you time naps and bedtime. This is an approximate reference, not medical advice; for any health concern or emergency, contact your pediatrician or emergency services, and follow WHO, CDC or your local health authority guidance.
All processing runs locally in your browser. Your data is not uploaded to any server.
100% Local
How to Use the Baby Sleep Window Tool
Enter your baby's age and press Show Window. The result is the typical length of time a baby that age can stay awake between sleeps.
Reading the result
Newborns can only stay awake for a short time before needing to sleep again.
The window lengthens steadily as babies grow.
Watch your baby's cues, such as yawning or rubbing eyes, near the end of the window.
A single long stretch is normal; these are averages, not rules.
Features
Reference awake window for every age from birth to three years
Simple guidance on watching for tired cues
Pairs well with a nap and bedtime routine
This is an approximate reference, not medical advice; for any health concern or emergency, contact your pediatrician or emergency services, and follow WHO, CDC or your local health authority guidance.
All processing runs locally in your browser. Your data is not uploaded to any server.
If your baby is consistently hard to settle, try shortening the window slightly. Sleep needs change quickly in the first year.