😴 Sleep Calculator

Find optimal bedtimes based on sleep cycles.

How to Use the Sleep Calculator

Find optimal sleep times based on cycles:

  1. Option A: Enter wake time, get bedtime.
  2. Option B: Enter bedtime, get wake time.

Sleep Cycles: Each ~90 minutes (light, deep, REM sleep). Waking at cycle end feels refreshed.

Recommendations: Adults need 7-9 hours (5-6 cycles). Allow 15 min to fall asleep. Consistent schedule improves quality. Avoid screens 1 hour before bed.