Sleep Calculator
Sleep cycles are roughly 90 minutes. Waking between cycles can help you feel more refreshed. Enter when you want to wake (or go to bed) and we suggest times based on cycle boundaries.
Sleep Calculator
How this is calculated
We add or subtract multiples of 90 minutes from your target time and show options. For example: wake at 7:00 → consider bed at 21:30, 23:00, 00:30, etc.
Use this tool for
Use it to plan bedtime or alarm so you wake after a full cycle. Not a substitute for medical sleep advice.
Common questions
How do I use this utility?
Enter the required values in the form above. The result updates automatically.
