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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.