Sleep Calculator

Total sleep and 90-minute sleep cycles between bedtime and wake time.

Best times to go to bed

9:45 PM or 11:15 PM

to wake refreshed at 7:00 AM

6 cycles · 9h sleep

9:45 PM

5 cycles · 7.5h sleep

11:15 PM

4 cycles · 6h sleep

12:45 AM

3 cycles · 4.5h sleep

2:15 AM

Start winding down

9:15 PM

Set a bedtime reminder

Pick a recommended time and add it to your calendar.

Google Calendar

Calendar events repeat daily with a 30-minute wind-down alert. The browser reminder works while this tab stays open.