Sleep Calculator
Find the best time to go to bed or wake up based on 90-minute sleep cycles.
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6 cycles (9h)
12:45 PM5 cycles (7.5h)Recommended
2:15 PM4 cycles (6h)
3:45 PM3 cycles (4.5h)
5:15 PMAdvertisement
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Frequently Asked Questions
What is a sleep cycle?
A sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM sleep. Waking up at the end of a cycle helps you feel more refreshed.
Why 15 minutes to fall asleep?
The average person takes 10-20 minutes to fall asleep. We use 15 minutes as a standard estimate. If you typically fall asleep faster or slower, adjust accordingly.
Can I use this if I take naps?
Yes, but this calculator is designed for your main nighttime sleep. Naps are shorter and don't follow full 90-minute cycles the same way. Use the calculator for your primary sleep schedule.