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Sleep Cycle Calculator

Enter your wake-up time to get suggested bedtimes (based on sleep cycles).

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Suggested bedtimes

6 cycles

09:45 PM

Includes ~15 min to fall asleep

5 cycles

11:15 PM

Includes ~15 min to fall asleep

4 cycles

12:45 AM

Includes ~15 min to fall asleep

Tip (India): keep dinner light and avoid heavy tea/coffee after 6 PM for better sleep quality.

FAQ

How does this sleep calculator work?

It counts 90-minute sleep cycles and subtracts an extra ~15 minutes to fall asleep.

How many cycles are best?

Many adults feel good with 4–6 cycles (6–9 hours). Try and see what works for you.

Does it consider naps or sleep debt?

No, it’s a simple cycle-based suggestion.