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Sleep Calculator
Calculate ideal bedtime and wake-up times based on sleep cycles
Sleep Cycles
Each sleep cycle lasts about 90 minutes. A good night includes 5-6 complete cycles (7.5-9 hours). Waking between cycles helps you feel refreshed.
How it works
- Enter your wake-up or bedtime
- See optimal sleep/wake times based on 90-min cycles
- Accounts for time to fall asleep
Want to learn more?
Read the complete guide with examples and tips
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