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Wake window calculator

Enter your child's age and morning wake time to see wake windows, nap start times and a target bedtime for today.

9 months
Newborn5 years
Wake window
2.5–3.5 hrs
Naps today
2
Target bedtime
6:15 PM
Your schedule today
6:30 AMWake
9:30 AMNap 1
10:53 AMWake
1:53 PMNap 2
3:15 PMWake
6:15 PMBedtime

All times are approximate. Adjust by 30–60 minutes to suit your child.

Wake windows explained

A wake window is the time your child should be awake between sleep periods. At 9 months, the ideal window is 2.5–3.5 hours. Too short and they won't have built enough sleep pressure to settle well. Too long and overtiredness makes settling harder, not easier.

What's normal
  • ·Two naps daily — morning and afternoon
  • ·Wake windows of 2.5–3.5 hours between sleep periods
  • ·Night waking may increase during the 8–10 month regression
See the full 9 months sleep guide →
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Methodology grounded in paediatric sleep research and evidence-based clinical practice. Schedule data, wake window recommendations, and regression timelines are derived from published guidelines including those of the American Academy of Sleep Medicine (AASM), the National Sleep Foundation, and paediatric sleep research published in peer-reviewed journals.

Read our full methodology →