Sleep Calculator

What time to go to bed, or wake up, between sleep cycles.

This is a rough guide, not medical advice. If you sleep too much or too little, talk to a doctor.

Your time

Your times

Go to bed at

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    Real sleep cycles vary from night to night. How it works, sources and FAQ

    Adjust:

    15 is only a starting point. Use your own estimate.

    Cycles last about 80 to 100 minutes.

    How it works, sources and FAQ