DAILY & PROGRESS / BUILT FOR YOU
Sleep Cycle Calculator.
Explore approximate bedtimes and wake-up times based on sleep-cycle estimates.
ABOUT THIS TOOL
Useful by design.
An educational timing calculator using 90-minute cycles and a small allowance for falling asleep. Real sleep cycles vary substantially.
How to use it
Enter a target wake time or bedtime. See a few suggested clock times and choose a schedule that allows adequate sleep.
Tips and limitations
Most adults generally need at least seven hours of sleep; this tool is not a medical sleep recommendation.
QUICK ANSWERS
Good questions.
Are all sleep cycles 90 minutes?
No. This is an oversimplified planning aid.
Is this medical advice?
No. Talk with a qualified professional about persistent sleep issues.
Is Sleep Cycle Calculator free?
Yes. This tool can be used without creating an account or paying a subscription. Selected tools have a clearly labelled advertisement to help support their development.
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