Food & lifestyle
Sleep Cycle Calculator
Waking at the end of a sleep cycle, rather than in the middle of deep sleep, can make mornings feel easier. Adults need about five or six cycles.
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How this is worked out
A sleep cycle averages about 90 minutes. We add the time you take to fall asleep and count back (or forward) in 90-minute steps, showing 4 to 6 cycles — 6 to 9 hours.
Questions people ask
Are cycles always 90 minutes?
No — they range from roughly 70 to 120 minutes and change through the night. Use the times as a guide, and keep a regular wake time above all.