Sleep cycles typically last 90 minutes and include different stages of sleep.
Sleep Cycle Stages:
- Light Sleep: Transition phase, easy to wake up
- Deep Sleep: Physical recovery and growth
- REM Sleep: Mental consolidation and dreaming
Optimal Sleep:
- 5-6 cycles: 7.5-9 hours - Most adults' optimal range
- 4 cycles: 6 hours - Minimum for most adults
- 3 cycles: 4.5 hours - Not recommended long-term
Tips for Better Sleep:
- Maintain consistent sleep schedule
- Avoid screens 1 hour before bed
- Keep bedroom cool and dark
- Avoid caffeine late in the day
- Exercise regularly but not before bed
This calculator assumes 15 minutes to fall asleep. Individual sleep needs may vary based on age, genetics, and lifestyle.