Sleep Calculator
Optimize your sleep with science-based REM cycle calculations
I want to wake up at...
I'm going to sleep now
Select your target time:
Recommended Sleep Schedule
Includes 14 minutes to fall asleep. Each sleep cycle is ~90 minutes.
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How to Use the Sleep Calculator?
Using a sleep cycle calculator is the best way to ensure you wake up feeling refreshed. Our tool uses the science of REM cycles (Rapid Eye Movement) to determine the optimal time for you to go to bed or wake up.
Why 90-Minute Cycles?
A typical human sleep cycle lasts about 90 minutes. Waking up in the middle of a cycle can leave you feeling groggy and tired. Waking up at the end of a cycle ensures you feel energized.
Features of this Tool:
- Smart Calculation: Accounts for the average 14 minutes it takes to fall asleep.
- Dual Modes: Calculate when to wake up if you sleep now, or when to sleep to wake up at a specific time.
- Dark Mode: Easy on the eyes for night-time usage.
- Export Data: Save your sleep schedule as PDF or CSV.
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