Sleep Cycle Calculator
Explore Sleep Cycles by Duration
Select a number of cycles to see the approximate sleep duration and likely bedtime or wake time.
Choose your settings and calculate.
Understanding the Estimate
- Cycle length
- Often described as roughly 90 minutes, though it varies by person and across the night.
- Sleep latency
- The time between trying to sleep and actually falling asleep.
- Total sleep opportunity
- The full span available for sleeping, including brief awakenings.