Sleep Calculator

Calculate optimal sleep and wake times based on 90-minute sleep cycles. Quality sleep occurs in complete sleep cycles, so waking up between cycles helps you feel more refreshed and energized.

What time do you want to wake up?

What time are you going to bed?

Preferred number of sleep cycles (optional)

How Sleep Cycles Work

Sleep occurs in cycles of approximately 90 minutes. Each cycle consists of different stages, including light sleep, deep sleep, and REM (Rapid Eye Movement) sleep. Waking up at the end of a cycle, rather than in the middle, can help you feel more alert and refreshed.

Recommended Sleep Duration

Adults (18-64 years): 7-9 hours (5-6 cycles)
Older adults (65+ years): 7-8 hours (5 cycles)
Teenagers (14-17 years): 8-10 hours (5-6 cycles)
Children (6-13 years): 9-11 hours (6-7 cycles)

Tips for Better Sleep

Keep a consistent sleep schedule, even on weekends
Allow 14 minutes to fall asleep (already factored into calculations)
Avoid screens and bright lights 1 hour before bedtime
Keep your bedroom cool, dark, and quiet
Avoid caffeine and heavy meals close to bedtime
Exercise regularly, but not too close to bedtime

Disclaimer

This sleep calculator is for informational purposes only and should not replace professional medical advice. If you experience chronic sleep problems, consult a healthcare professional or sleep specialist.