Sleep Calculator
Calculate optimal sleep and wake times
Calculate optimal sleep and wake times based on sleep cycles. Wake up refreshed by timing your sleep correctly.
Frequently Asked Questions
What is a sleep cycle?
A sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages.
How many cycles do I need?
Most adults need 5-6 cycles (7.5-9 hours). Waking between cycles helps you feel refreshed.