Plan from an interval you observed
Enter the last wake time and an awake interval from your own records. This adds the interval to the clock; it does not calculate how long your baby should stay awake.
Read the source-linked guide to tired cues. An interval is a planning aid, not a reason to delay sleep.
How it works
- Find a usual awake interval in your records.
- Enter the last wake time and interval.
- Read the resulting clock time as arithmetic, not a sleep recommendation.
Related reading
Cocoon works this out from your logs automatically
Log feeds, sleep and growth in seconds and Cocoon surfaces wake windows, feeding rhythm and recorded growth, with CDC percentiles from age 2 — offline-first, and every feature free right now.
Common questions
Does age determine this time?
No. This tool uses the interval you enter, without an age table.
Is this a prediction?
No. It adds minutes to a clock time. Cocoon’s in-app estimates use several days of your records.
Where can I read about tired cues?
The linked wake-window guide cites Raising Children Network and explains the limits of clock estimates.
These tools organise records and reference information. They do not assess health or replace care. For concerns about your baby, contact your clinician.