Daily health
Sleep Calculator
Find sleep or wake times using 90-minute sleep cycles and a 15-minute fall-asleep estimate.
Your sleep times will appear here
Enter a wake or sleep time to see cycle-friendly options.
Tutorial
Sleep Calculator Tutorial
This tool suggests sleep or wake times based on 90-minute sleep cycles and a short fall-asleep estimate.
How to use
- Choose whether you want to wake up at a time or sleep at a time.
- Enter the target time.
- Click Calculate Sleep Times.
- Review the cycle-friendly options.
Example
If you want to wake up at 6:00 AM, the tool suggests bedtime options for 4, 5 or 6 sleep cycles.
Tips
- Most sleep cycles are roughly 90 minutes, but people vary.
- Use this for planning, not medical sleep advice.
Benefits
Makes bedtime planning easier.
Shows multiple sleep-cycle options.
Helps avoid guessing wake and sleep times manually.
Frequently asked questions
This tool suggests sleep or wake times based on 90-minute sleep cycles and a short fall-asleep estimate.
Yes. You can use this tool directly in the browser without creating an account.
Calculation history is not saved unless the site owner enables recent-calculation storage.