Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Sleep
REM Sleep Calculator
Estimate how much REM (dream) sleep you get each night based on your age, total sleep, quality, and alcohol intake. Use it to understand why you may feel unrested or mentally foggy.
Fill in the required fields to see your result.
Sleep
Sleep Cycle Optimizer
Find your ideal bedtime or wake time by aligning sleep with natural 90-minute cycles. Use it when planning your schedule to wake refreshed instead of groggy.
Fill in the required fields to see your result.
Key differences
| REM Sleep Calculator | Sleep Cycle Optimizer | |
|---|---|---|
| Category | Sleep | Sleep |
| Inputs required | 4 | 3 |
| Result | Estimated REM Sleep (hours) | Total Time Needed (minutes) |
| What it does | Estimate how much REM (dream) sleep you get each night based on your age, total sleep, quality, and alcohol intake. Use it to understand why you may feel unrested or mentally foggy. | Find your ideal bedtime or wake time by aligning sleep with natural 90-minute cycles. Use it when planning your schedule to wake refreshed instead of groggy. |