Liver-nourishing includes liver-nourishing and liver-clearing. Liver-nourishing focuses on sleep. Modern people often stay up late, and the damage to the liver is particularly serious. Most “night owls” have covet, which is a symptom of rising liver fire. The Yellow Emperor's Canon of Medicine records that “the blood of a person lies in the liver”. Modern medical research has confirmed that the blood flow into the liver during sleep is 7 times that when standing up. The increase of blood flow through the liver is conducive to enhancing the function of liver cells and improving the detoxification ability. Ensure sleep time, “clear liver -fire”, which can prevent liver-qi from rising too much.
调养肝脏包括养肝和清肝，养肝重在睡眠，现代人经常熬夜，对于肝脏的损害尤其严重。“夜猫子”大多双目赤红，这是肝火上升的症状。《黄帝内经》中记载：“人卧血归于肝”，现代医学研究证实，睡眠时进入肝脏的血流量是站立时的7倍，流经肝脏血流量的增加，有利于增强肝细胞的功能，提高解毒能力。保证睡眠时间，“清肝泻火”，这能预防肝气升发太过。
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