Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
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.
Sleep
Shift Work Sleep Calculator
Plan your sleep window around rotating or night shifts by accounting for shift times, commute, and adjustment buffers. Use it when your schedule changes to find the exact bedtime that protects your minimum sleep hours.
Fill in the required fields to see your result.
Key differences
| REM Sleep Cycle Calculator | Shift Work Sleep Calculator | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 3 | 3 |
| Result | Total Sleep Duration (minutes) | Total Recovery Time Needed (minutes) |
| What it does | 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. | Plan your sleep window around rotating or night shifts by accounting for shift times, commute, and adjustment buffers. Use it when your schedule changes to find the exact bedtime that protects your minimum sleep hours. |