What This Calculator Does
This tool chooses a practical nap length from your available time, bedtime distance, and goal. It separates quick alertness from deeper recovery because those are different use cases.
Planning Rules
Deeper recovery: about 90 minutes when time and bedtime distance allow
Late-day protection: shorter naps when bedtime is close
Worked Example
If you have 30 minutes and bedtime is 7 hours away, the tool usually suggests a 20 minute nap plus a wake-up buffer. If you have 120 minutes and bedtime is far away, it may suggest a longer recovery nap.
Use The Result
Set an alarm for the nap itself and leave a wake-up buffer afterward. If naps repeatedly become long or urgent, check nighttime sleep duration and consistency.
Frequently Asked Questions
How long should a power nap be?
Many people use a short 10-30 minute nap for alertness because it is less likely to create heavy grogginess than a long partial sleep cycle.
When should I avoid a long nap?
A long or late nap can make bedtime harder for some people. If bedtime is close, this calculator favors a shorter nap or no late recovery nap.
Is a 90 minute nap always better?
No. A longer nap may help recovery when you have enough time and bedtime is far away, but it can also produce grogginess or delay nighttime sleep.