Nap planning
Nap calculator
Choose when your nap starts and estimate a few wake-up times for short naps and one full-cycle nap. These are planning estimates, not guarantees.
How it works
Short nap, power nap, or full cycle
The nap calculator starts with your local nap start time, adds your selected fall-asleep estimate, then adds 10, 20, 30, or 90 minutes asleep. With a 10-minute fall-asleep estimate, a 1:00 PM start creates 1:20, 1:30, 1:40, and 2:40 PM options.
The short options are deliberately close together because they answer a different question from the 90-minute option: quick reset versus a full-cycle estimate. The page does not rank one as medically better.
The arithmetic follows the same transparent limits described in the methodology.
Timing caution
Late naps may affect bedtime
A nap can be useful for planning a short rest, but daytime sleep can make bedtime harder for some people, especially later in the day.
Use the late-day note as a caution, not a rule. Sleep needs, schedules, work, and stress vary by person.
If it is too late for a nap, try a short wind-down routine instead.
Nap calculator FAQ
How long should I nap?
This tool shows 10, 20, 30, and 90 minute asleep-time options after your fall-asleep estimate. Shorter options are easier to fit into the day; the 90-minute option is a full-cycle estimate.
Why include a 90-minute nap?
Ninety minutes is a common planning approximation for one sleep cycle. Real sleep cycles vary, so treat it as context rather than an exact biological target.
Should I nap late in the day?
Late naps may make bedtime harder for some people. If it is already afternoon or evening, a shorter nap or a wind-down routine may be a safer planning choice.
Can a nap replace a full night of sleep?
No. This page is for planning a short rest window. It does not diagnose sleep problems or replace enough regular nighttime sleep.
Sources