《灵枢·大惑论》帝曰∶病而不得卧者，何气使然者？岐伯曰∶卫气不得入于阴，常留于阳，留于阳则
阳气满，阳气满则阳跷盛，不得入于阴则阴气虚，故目不瞑矣。
此言因病不得卧，亦由卫气不得入阴之故，与前之半夏汤证义同，然其本病，或因外感，或因内伤，先当
详辨也。
帝曰∶病而目不得视者，何气使然？岐伯曰∶卫气留于阴，不得行于阳，留于阴则阴气盛，阴气盛则阴跷
满，不得行于阳则阳气虚，故目闭也。
此与上条为对待之病也。以卫气出于阳，则目开，留于阳而不行，则目不能瞑；卫气入于阴，则目瞑，留
于阴而不行，则目闭不能开。留于阳，则阳跷满；留于阴，则阴跷满。是阴阳二跷脉，为卫气出阳入阴之门户
道路也。
帝曰∶人之多卧者，何气使然？岐伯曰∶此人肠胃
大而皮肤涩，而分肉不解也。肠胃大则卫气留久，皮肤涩则分肉不解，其行迟。夫卫气者，昼日常行于阳，夜
行于阴，故阳气尽则卧，阴气尽则寤。故肠胃大，则卫气行留久；皮肤涩，分肉不解，此行迟。留于阴也久，
其气不精，则欲瞑，故多卧矣。
此言因肠胃大而皮肤涩，涩则不能解利，而卫气之出于表者迟钝；其肠胃大，而卫气之留于里者久矣。表
为阳，里为阴，卫气久留于阴，故其阳不精，而心神昏倦，则多卧也。
其肠胃小，皮肤滑以缓，分肉解利，卫气之留于阳也久，故少瞑也。
此与上条相对待，以明其理也。
《灵枢·大惑论》中黄帝问道：患病后无法入睡，是什么气机导致的？岐伯回答说：卫气（运行于脉外、具有防御和温煦作用的气）不能进入阴分，常停留在阳分。停留在阳分则阳气充盈，阳气充盈则阳跷脉（起于足跟内侧，主司眼睑开合的奇经八脉之一）亢盛；不能进入阴分则阴气虚弱，所以眼睛无法闭合（失眠）。
这段文字论述的是因病导致无法入睡，也是由于卫气不能入阴的缘故，与前文半夏汤证的病机相同，但其根本病因，可能是外感邪气，也可能是内伤杂病，应当先详细辨别。
黄帝问道：患病后眼睛无法睁开视物，是什么气机导致的？岐伯回答说：卫气停留在阴分，不能运行到阳分。停留在阴分则阴气亢盛，阴气亢盛则阴跷脉（起于足跟内侧，主司眼睑开合的奇经八脉之一）满实；不能运行到阳分则阳气虚弱，所以眼睛闭合。
这种情况与上一条所述病症是相对立的。卫气出于阳分，则眼睛睁开；停留在阳分而不能运行，则眼睛无法闭合（失眠）；卫气进入阴分，则眼睛闭合（睡眠）；停留在阴分而不能运行，则眼睛闭合无法睁开。卫气停留在阳分，则阳跷脉满实；停留在阴分，则阴跷脉满实。因此，阴阳二跷脉，是卫气由阳入阴、由阴出阳的门户和道路。
黄帝问道：人之所以嗜睡多卧，是什么气机导致的？岐伯回答说：这个人的肠胃较大，皮肤涩滞，肌肉间隙不通利。肠胃大则卫气在体内停留的时间较长，皮肤涩滞则肌肉间隙不通利，卫气运行的速度缓慢。卫气白天通常运行于阳分，夜晚运行于阴分，所以阳气行尽则入睡，阴气行尽则醒来。因为肠胃大，所以卫气在体内停留时间长；因为皮肤涩滞、肌肉间隙不通利，所以卫气运行迟缓。卫气在阴分停留时间久，其气就不精纯振奋，人就想睡觉，所以表现为多卧。
这段文字论述的是因肠胃大而皮肤涩滞，涩滞则不能通利，导致卫气出于体表的运行迟钝；同时肠胃大，导致卫气留在体内的时间长久。体表为阳，体内为阴，卫气长时间停留在阴分，所以阳气不精纯振奋，心神昏沉疲倦，因此表现为多卧。
如果一个人的肠胃小，皮肤滑润舒缓，肌肉间隙通利，卫气在阳分停留的时间就长，所以睡眠时间少（少瞑）。
这与上一条情况相对立，用以阐明其中的道理。
In the "Da Huo Lun" (Treatise on Great Confusion) of the *Ling Shu* (Spiritual Pivot), the Yellow Emperor asked: "What qi causes a person to be ill and unable to lie down (sleep)?" Qibo replied: "When Wei Qi (Defensive Qi, qi circulating outside the vessels providing defense and warming) fails to enter the Yin aspect, it remains constantly in the Yang aspect. Remaining in the Yang aspect leads to an excess of Yang Qi; an excess of Yang Qi results in hyperactivity of the Yang Qiao Mai (One of the Eight Extraordinary Vessels, originating from the inner heel, governing eyelid opening). Failure to enter the Yin aspect leads to deficiency of Yin Qi; thus, the eyes cannot close (insomnia)."
This passage discusses insomnia caused by illness, which is also due to the failure of Wei Qi to enter Yin. The pathogenesis is identical to that of the Banxia Tang (Pinellia Decoction) syndrome mentioned earlier; however, the underlying disease may stem from external contraction or internal injury, requiring careful differentiation first.
The Yellow Emperor asked: "What qi causes a person to be ill and unable to open their eyes to see?" Qibo replied: "When Wei Qi remains in the Yin aspect and fails to circulate to the Yang aspect, remaining in Yin leads to an excess of Yin Qi; an excess of Yin Qi results in fullness of the Yin Qiao Mai (One of the Eight Extraordinary Vessels, originating from the inner heel, governing eyelid closing). Failure to circulate to the Yang aspect leads to deficiency of Yang Qi; thus, the eyes remain closed."
This condition is the counterpart to the previous clause. When Wei Qi emerges from Yang, the eyes open; if it remains in Yang without circulating, the eyes cannot close (insomnia). When Wei Qi enters Yin, the eyes close (sleep); if it remains in Yin without circulating, the eyes stay closed and cannot open. When Wei Qi remains in Yang, the Yang Qiao Mai becomes full; when it remains in Yin, the Yin Qiao Mai becomes full. Therefore, the Yin and Yang Qiao Mai are the gateways and pathways for Wei Qi to exit Yang and enter Yin, and vice versa.
The Yellow Emperor asked: "What qi causes a person to sleep excessively?" Qibo replied: "This person has large intestines and stomach, dry/stagnant skin, and unresolved intermuscular spaces. Large intestines and stomach cause Wei Qi to remain inside for a long time; dry/stagnant skin causes unresolved intermuscular spaces, making its movement slow. Wei Qi normally circulates in Yang during the day and in Yin at night; thus, when Yang Qi is exhausted, one sleeps, and when Yin Qi is exhausted, one wakes. Because the intestines and stomach are large, Wei Qi remains inside for a long time; because the skin is dry/stagnant and intermuscular spaces are unresolved, its movement is slow. Remaining in Yin for a long time makes the Qi impure and unvigorous, leading to drowsiness; thus, excessive sleeping occurs."
This passage discusses how large intestines and stomach combined with dry/stagnant skin prevent smooth circulation, causing the emergence of Wei Qi to the exterior to be sluggish; simultaneously, large intestines and stomach cause Wei Qi to remain inside for a long time. The exterior is Yang, the interior is Yin. Since Wei Qi remains in Yin for a long time, Yang Qi is not pure and vigorous, leading to mental dullness and fatigue, resulting in excessive sleeping.
If a person has small intestines and stomach, smooth and relaxed skin, and resolved intermuscular spaces, Wei Qi remains in Yang for a long time; thus, they sleep less (less somnolence).
This stands in contrast to the previous clause to elucidate the principle.