Sleep Cycle Calculator
Free Sleep Cycle Calculator to find optimal bedtimes or wake times based on 90-minute sleep cycles. Wake up refreshed by timing your sleep correctly.
About This Calculator
Timing your sleep to align with your natural sleep cycles helps you wake up feeling refreshed. This calculator lets you work forward from bedtime or backward from wake time to find optimal sleep schedules.
Frequently Asked Questions
Should I calculate bedtimes or wake times?
Both approaches work. If you know when you need to wake up, calculate bedtimes. If you know when you go to bed, calculate optimal wake times. Our calculator supports both directions.
Can I customize the sleep cycle duration?
Yes, while 90 minutes is the average sleep cycle, individual cycles can range from 70-120 minutes. You can adjust the cycle duration in the calculator to match your personal sleep pattern.
How do I find my natural sleep cycle?
Track when you naturally wake up without an alarm over a few days. The time between when you fell asleep and waking naturally, divided by 90, should be close to a whole number. This helps identify your natural cycle length.