Health & Fitness CalculatorsPrivate by design
Sleep Cycle Calculator
Enter a wake time or bedtime to calculate recommended times based on completing full 90-minute sleep cycles.
How to use this tool
- 1Choose wake time or bedtime mode.
- 2Enter the time.
- 3See recommended times for 4-6 full sleep cycles.
Frequently asked questions
Why do sleep cycles matter?+
Waking up between cycles (rather than mid-cycle, during deep sleep) tends to feel less groggy, even at the same total sleep duration.
Related tools
Keep the boring tools boring.
If this saved you five minutes of nonsense, you can help keep the free tools running.
Buy the toolbox a coffee