# 睡眠和身體活動量依然有著雙向關係,只是明顯偏向由睡眠帶動體能活動:隨著睡眠狀況的提升,體能活動量也明顯提升;而且睡眠對白天的體能活動有強烈影響。參與者由於睡眠的提升,會感到較為警醒有活力,情緒低落的程度也相對減少。——《為什麼要睡覺?》
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