Health Tools
睡眠周期计算器
根据90分钟睡眠周期找到最佳起床或入睡时间
Best bedtimes to wake up at 07:00 AM
09:46 PM
6 sleep cycles(9 hours of sleep)Optimal
11:16 PM
5 sleep cycles(7.5 hours of sleep)Recommended
12:46 AM
4 sleep cycles(6 hours of sleep)
02:16 AM
3 sleep cycles(4.5 hours of sleep)
03:46 AM
2 sleep cycles(3 hours of sleep)
05:16 AM
1 sleep cycle(1.5 hours of sleep)
A full sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages. Waking up at the end of a cycle (instead of mid-cycle) helps you feel more refreshed. Most adults need 4–6 complete cycles per night.
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