sleep
Best Sleep Cycle Schedule for Adults
A simple explanation of sleep cycles and how to plan your bedtime around wake-up time.
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A common way to think about sleep is in 90-minute cycles. Many adults feel better when they wake up between cycles instead of during one.
A sleep calculator works backward from your target wake-up time and suggests bedtimes that line up with full cycles. It is a planning tool, not medical advice.
This can be useful for workdays, school routines, travel, and days when you need to wake up earlier than usual.