What time should I go to bed if I wake up at 6:30 AM?

I count back from 6:30 AM in 90-minute blocks, then leave 15 minutes to fall asleep. Pick the amount of sleep that fits tonight.

Four bedtimes for a 6:30 AM alarm

90-minute cycles, 15 minutes to fall asleep

9:15 PM6 cycles, 9 h 0 min
10:45 PM5 cycles, 7 h 30 min
12:15 AM4 cycles, 6 h 0 min
1:45 AM3 cycles, 4 h 30 min

Open the sleep calculator