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At the moment when one desires to sleep but has not yet fully fallen asleep, suddenly raising a hand and jumping or trembling is commonly attributed by the world to blood failing to nourish the sinews (Jin), but this is actually incorrect; it is a sign of fluids (Jin) failing to moisten the vessels (Mai).

When the Qi and vessels of the human body move, all the hundred vessels throughout the body surge in response. There must be fluids to moisten them within, so that they can function naturally without obstruction. If even one vessel becomes completely blocked and unpassable, then Qi will also fail to reach that location, becoming silent and motionless. However, vessels cannot remain blocked forever, nor can Qi fail to arrive. When the fluids in the vessels are consumed and dried up, if there is any place lacking moisture, or if slight phlegm threads obstruct it, then Qi, having moved and then become stifled, will move again after being stifled. In this cycle of contraction and release, the hundred vessels are shaken and jump. The occurrence of this movement has no fixed location; it may arise in the limbs or in the chest, arising wherever the Qi touches. This phenomenon, appearing occasionally, is not sufficient to constitute a disease. If treatment is desired, only sweet-cool methods to generate fluids should be used. Children often exhibit this phenomenon during sleep, which is colloquially considered an omen of bone growth, but is actually due to phlegm obstructing Qi. For adults who experience convulsions (Jing Che) immediately upon attempting to sleep each day, this indicates excessive phlegm, specifically dry phlegm resulting from fluid deficiency. The primary treatment should be generating fluids, with dispelling phlegm as an adjunct. When fluids are abundant, phlegm is carried along and becomes slippery, making it easy to expel. In cases of blood deficiency where blood fails to nourish the sinews, symptoms such as stiffness and inconvenience in the joints, or whole-body tremors with a desire to stretch (Pi Ran), should be observed. These are caused by injury from wind-heat or excessive sweating, referred to as "sinew twitching and muscle quivering" (Jin Ti Rou Yu). Therefore, individuals with deficient and dry heart fluids often have scattered spirit (Shen). At the moment of desiring sleep, they experience inexplicable fright and vigilance in the heart, with slight twitching (Yu Yi) in the limbs, which may continue incessantly, preventing sleep. Although the manifestation may be subtle, the root of the disease is deep. If caused suddenly by wind-heat and excessive sweating, sweet and sour substances should be used to nourish, as stated in the classics: "The Heart dislikes flaccidity; urgently eat sour to astringe it." For those with chronic illness or no apparent illness who present similarly, large doses of sweet-cold and sour-warm medicines are more appropriate to generate fluids and nourish blood, embodying the principle that "when fluids and essence complement each other, the Spirit arises naturally." Another cause is water-fluids rushing to attack the Heart, which requires pungent-dispersing and bland-leaching agents combined with slippery-moistening properties to carry phlegm up and down for differentiation and purification. This corresponds to the description of "great palpitation in the Heart, feeling fearful as if someone were about to capture one," indicating that Heart Yang is suppressed by water-pathogens, causing the Spirit to be unsettled.