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Sleep Calculator

Pick a wake time or sleep now. Four bedtimes on 90-minute cycles.

min
min

How to use it

  1. Pick wake at or sleep now.
  2. Set the time, and how long you take to fall asleep.
  3. Read the best times to go to bed or wake up.
  4. Copy the summary to keep it.

Common uses

Plan a bedtime for an early start. Wake up between sleep cycles.

Privacy

Your numbers stay in this browser. Nothing is uploaded. Refresh and they're gone. We do not see them.