Health Calculator
Sleep Cycle Calculator
Find recommended bedtimes or wake-up times based on 90-minute sleep cycles.
This sleep cycle calculator helps estimate ideal bedtime and wake-up times based on 90-minute sleep cycles.
Recommended times
Based on 90-minute cycles and about 15 minutes to fall asleep.
Enter a time and tap Calculate to see recommendations.
How Sleep Cycles Work
An average sleep cycle is around 90 minutes. During the night, adults usually experience multiple cycles that move through lighter and deeper stages of sleep.
Timing wake-up between cycles may help some people feel more refreshed. This tool estimates bedtimes and wake times using that common cycle length, plus a short buffer for falling asleep.
Sleep Cycle FAQ
How long is a sleep cycle?+
A sleep cycle is approximately 90 minutes.
How many sleep cycles should I get?+
Many adults aim for around 4-6 sleep cycles, although individual needs vary.
Does this calculator guarantee better sleep?+
No. This calculator provides an estimate based on average sleep cycle timing.