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.
Leave with a useful record, even without a time estimate
Record the last wake time you know. Mark other times as unknown if needed.
Record whether a nap happened, was tried without sleep, or was not offered. Keep these different.
Save what you have for yourself or another caregiver. Add the next actual sleep when it happens.
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.
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.
Method and sources
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.
Example — nothing has been recorded. Read these structures without entering anything. No default sleep times or age recommendation are supplied.
Three-nap structure
Structure only · version 1
Step
Assumption
Wake
The same chosen starting point
Nap 1
Your interval, then your assumed nap duration
Nap 2
Your interval, then your assumed nap duration
Nap 3
Your interval, then your assumed nap duration
Bedtime range
Your interval after the final assumed nap
The nap count is a comparison option, not a recommendation to change your day.
Two-nap structure
Structure only · version 1
Step
Assumption
Wake
The same chosen starting point
Nap 1
Your interval, then your assumed nap duration
Nap 2
Your interval, then your assumed nap duration
Bedtime range
Your interval after the final assumed nap
The nap count is a comparison option, not a recommendation to change your day.
Three different meanings
Recorded
What you explicitly entered as having happened.
Planned
A future assumption. Never added to recorded sleep.
Estimated [ … ]
A range of possible times. Unknown stays unknown.
Compare these structures using my own parameters
Structure templates v1 · no numerical age template approved. You can also start from what happened without choosing an example.
Nap schedules by age
Age references give context. Your comparison uses the assumptions you enter; it does not infer a nap count from age. Read the six-month guide to understand the two structures before choosing one.
How the nap schedule is built
Start with an actual wake time and enter the interval you want to compare. The current comparison keeps your recorded entries separate from the proposed evening range. It does not choose an age-based nap count or fill in missing naps.
What to do when the schedule gets off
Babies are not clocks. When a nap runs short or long, recompute the next wake window from the actual end of the nap, not what the schedule originally said.
Two naps, three naps, one nap?
Changing a nap count changes the assumed day. Compare the structures above without treating either one as a readiness assessment. Continue your current arrangement or discuss recurring difficulties with your care professional.