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==晝夜節律==

==晝夜節律==

{{TNT|Further|Dark period}}

{{TNT|Further|Dark period}}

The circadian rhythm is the body clock aligned to local solar time by light exposure and food intake, among other factors. It generates hormonal changes throughout the day consistently to produce effects on the body. One of the main effects is the secretion of [[Wikipedia:Melatonin|melatonin]], the presence of which is essential for entering SWS, and also affects the timing of REM sleep.

晝夜節律（Circadian rhythm）是體内的生物時鐘，主要通過曝光和食物攝入等因素與當地的太陽時保持一致。它在一天中持續帶動荷爾蒙變化，對身體產生影響。晝夜節律其中一個主要影響是[[Wikipedia:Melatonin|褪黑激素（melatonin）]]的分泌。它的存在對進入SWS至關重要，同時對REM的出現時間也會產生影響。