Nap Calculator: How Long Should You Nap?
Nap Calculator
Choose a nap type to see how long to sleep and when you'll wake.
Choose a nap type and the calculator tells you when to wake up, including 14 minutes to fall asleep. The three options match the most common nap lengths: short enough to skip deep sleep, a full cycle, or a longer recovery nap.
Worked example
If you lie down at 2:00 PM:
| Nap | Wake at | Best for |
|---|---|---|
| Power nap (20 min) | 2:34 PM | Quick alertness boost, minimal grogginess |
| Full cycle (90 min) | 3:44 PM | Includes deep sleep and REM |
| Recovery (3 hours) | 5:14 PM | For heavy sleep debt; avoid late in the day |
Which nap length to pick
A 20-minute nap is the safe default for an afternoon dip. A 90-minute nap suits days when you have time for a full cycle. Longer naps taken late in the day can make it harder to fall asleep that night.
Timing matters
Early to mid afternoon is usually the best window. Set an alarm for the wake time shown, and avoid napping within a few hours of your usual bedtime.
Frequently asked questions
How long should a nap be?
For most people, about 20 minutes for a quick boost or about 90 minutes for a full cycle. Anything in between risks waking from deep sleep.
Does a coffee nap work?
Some people drink coffee just before a short nap so the caffeine starts working as they wake. Individual results vary, and it is best avoided late in the day.
Will napping ruin my night sleep?
Short, early naps rarely do. Long or late naps can push back your bedtime, especially if you already struggle to fall asleep.
Related guides and tools
- Best nap length: 10, 20, 30 or 90 minutes
- The coffee nap hack
- Naps before a night shift
- Sleep debt and catching up
- How sleep cycles work
Results are estimates and general information, not medical advice. Talk to a doctor if you have ongoing sleep problems.