Tool | Bedtime
A late nap or a skipped nap throws off the whole evening. Enter when the last nap ended and compare an evening range using your own settings.
An interval is the awake time from waking until the next sleep starts. It is different from nap length. You do not need to guess a number to use this page.
A missed nap by itself cannot choose a new bedtime. Keep following any existing care instructions; use the guide to review your situation rather than inventing an interval.
Add a known event first to enable saving your record.
Choose a starting point. Nothing is recorded until you submit an entry.
Compare using the last recorded wake and your settings. Nothing is added to your actual record.
Start with what you know. You can save your record without comparing times. Record what happened
Save or share this dayRecorded sleep: 0–0 minutes. This includes only the sleep you’ve recorded.
No actual events recorded yet.
2026-10-11 · UTC · Age not entered · 0 recorded entries
Choose Save on this device to keep this day after closing the tab.
What you explicitly entered as having happened.
A future assumption. Never added to recorded sleep.
A range of possible times. Unknown stays unknown.
↓ Compare using the last wake and your selected interval
A possible range, with its assumptions and conflicts
Or: information is missing. Add only what you know.
Missing details stay missing. A short nap alone does not set a bedtime.
Sequence view, not a time scale. Estimated ranges and unknown times stay visible. Planned sleep is excluded from recorded totals.
Was this useful for your situation?
We add your interval to the last recorded wake time. With ranges, the earliest wake plus the shortest interval gives the earliest result; the latest wake plus the longest interval gives the latest result. Later planned naps use your assumed duration, so uncertainty can widen.
Trying to settle without sleep and not offering a nap do not reset the wake time. Unknown times remain unknown. A plan never becomes a recorded event just because its time has passed.
These calculations do not determine when a baby will sleep, recommend a nap transition, or diagnose a sleep problem. No age-based rules are approved in this version. Follow any professional care plan and seek professional advice for health concerns or persistent difficulties.
Current method: user-defined interval arithmetic, version 1. No medical review is claimed. For general sleep and care information, see American Academy of Pediatrics: baby sleep. That resource is not used to derive an individual wake interval.
Start with the last known wake time and your own interval. A short, late, or missed nap does not automatically trigger a minute adjustment. You can compare two sets of assumptions and check a preferred evening range.
You do not need a complete sleep history. Keep unknown times unknown. A plan is only selected when you choose it, and it never adds sleep to the recorded total.