Sleep Calculator

Find optimal bedtime and wake times based on 90-minute sleep cycles.

Wake up time

9:45 PM✓ recommended

9h · 6 cycles

11:15 PM✓ recommended

7.5h · 5 cycles

12:45 AM

6h · 4 cycles

2:15 AM

4.5h · 3 cycles

Assumes ~15 minutes to fall asleep. Each sleep cycle is ~90 minutes.