Sleep Calculator

Pick a wake-up time to see good bedtimes based on 90-minute sleep cycles (plus time to fall asleep).

Wake-up time

Go to bed at one of these

—

6 cycles (9 h)—

5 cycles (7.5 h)—

4 cycles (6 h)—

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How it works

Bedtime = wake time − (cycles × 90 min) − 15 min to fall asleep

Frequently Asked Questions

How does the Sleep Calculator work?

Pick a wake-up time to see good bedtimes based on 90-minute sleep cycles (plus time to fall asleep).

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.