Sleep Calculator

Find the optimal bedtime or wake-up time based on 90-minute sleep cycles.

I want to wake up at...

Your Age

Recommended: 7-9 hours

10:00 PM (6 cycles, 9h)

11:30 PM (5 cycles, 7.5h)

1:00 AM (4 cycles, 6h)

2:30 AM (3 cycles, 4.5h)