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睡眠计算器

😴睡眠计算器——最佳就寝时间

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专业提示

Even a 20-minute "power nap" between 1–3 PM can restore alertness without disrupting nighttime sleep. Longer naps (>30 min) risk sleep inertia and disrupted night sleep.

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你知道吗?

REM sleep lengthens in later cycles — your first REM stage is about 10 minutes; the last (before waking) can be 60 minutes. This is why you often remember dreams from the morning.

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