Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Sleep
Sleep Cycle Calculator
Find the ideal bedtime or wake-up time by aligning with 90-minute sleep cycles. Use it when planning your schedule to wake up refreshed, not mid-cycle groggy.
Fill in the required fields to see your result.
Sleep
REM Sleep Cycle Calculator
Find the ideal bedtime to wake up refreshed by aligning your alarm with the end of a complete 90-minute sleep cycle. Use it any night you want to avoid that groggy, mid-cycle wake-up feeling.
Fill in the required fields to see your result.
Key differences
| Sleep Cycle Calculator | REM Sleep Cycle Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 2 | 3 |
| Result | Total Sleep Time Needed (hours) | Total Sleep Duration (minutes) |
| What it does | Find the ideal bedtime or wake-up time by aligning with 90-minute sleep cycles. Use it when planning your schedule to wake up refreshed, not mid-cycle groggy. | Find the ideal bedtime to wake up refreshed by aligning your alarm with the end of a complete 90-minute sleep cycle. Use it any night you want to avoid that groggy, mid-cycle wake-up feeling. |