Good Night, Baby · Bonus 10

Sleep Window Calculator

Find an estimated window for your baby's next sleep, based on age and the time they last woke up

Quick Calculator · Real-Time Estimate

"Babies don't run on perfect clocks. This tool is a starting point — pair it with your baby's own sleepy cues."

Baby's Age
0–3 mo
3–6 mo
6–9 mo
9–12 mo
12–18 mo
18+ mo
Time Baby Woke Up (from the last sleep)
Which Sleep Are You Calculating?
☀️ First Nap
☀️ Second Nap
☀️ Last Nap
🌙 Night Sleep
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Next Sleep Opportunity
—

Start watching for sleepy signs within this window — every baby settles at their own point inside it.

🌅 Now —
↓
🟢 Best time to start the wind-down —
↓
😴 Likely sleep time —
Is Baby Showing Sleepy Signs Right Now?
Yes, seems tired
Still seems active
Fussy / irritable
Not sure
Age
—
Woke up at
—
Likely window
—
Watch for signs
Now through the window

Add this window to your Interactive Sleep Tracker to compare estimates with what actually happens over time.

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✦ Reference

Quick Interpretation Guide

Use what actually happens at bedtime to read your results.

If baby falls asleep easily
The window was very likely well-timed. Note it down and try the same window again tomorrow.
If it takes a long time to fall asleep
Wait a little longer before the next attempt
Reduce stimulation before the sleep attempt
Review the bedtime or naptime routine
If baby becomes very agitated
The window may have been missed
Overtiredness may already be setting in
The environment may need adjusting