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The Wei Qi (Defensive Qi) circulates without pause. During the day, it travels through the Yang aspects; at night, it resides in the Yin aspects. If Wei Qi remains exclusively in the Yang, causing the Yang Qiao vessel to become excessive, Yang excess and Yin deficiency result, leading to restlessness at night. Conversely, if Wei Qi lingers in the Yin, filling the Yin Qiao vessel, Yin excess and Yang deficiency occur, resulting in agitation during the day. (The *Huangdi Zhenjing* [Yellow Emperor's Classic of Acupuncture] states: Wei Qi travels in the Yang during the day and in the Yin at night. If Wei Qi cannot enter the Yin, it often stays in the Yang. Staying in the Yang causes Yang Qi to become full; when full, the Yang Qiao vessel becomes excessive, preventing entry into the Yin. With deficient Yin Qi, one cannot find peace at night. If Wei Qi stays in the Yin and cannot travel to the Yang, staying in the Yin causes Yin to become excessive. When Yin is excessive, the Yin Qiao vessel is full, preventing entry into the Yang. With deficient Yang Qi, there is contention and unrest during the day.) Evening delirium with daytime clarity indicates a Yin deficiency syndrome. Daytime irritability with nighttime calmness indicates a Yang deficiency syndrome. (Zhang Zhongjing stated: In women suffering from Shanghan [Cold Damage] with fever, if menstruation occurs just then, they are clear-minded during the day but experience delirium at night; this is Heat entering the Blood Chamber [Xue Shi]. He also stated: After purgation followed by sweating, if the patient is irritable during the day unable to sleep, yet quiet at night, without vomiting or thirst, and lacking exterior or interior signs, with a deep, faint pulse and no significant heat on the body, Ganjiang Fuzi Tang [Dried Ginger and Aconite Decoction] should be administered. Heat entering the Blood Chamber occurs due to Yin deficiency allowing pathogenic invasion, hence evening delirium and daytime clarity. Purging followed by sweating leads to loss of Yang and Wei Qi remaining in the Yin, hence daytime irritability and nighttime calmness.) One must regulate Wei Qi so that each returns to its proper domain; when the two Qi harmonize, the condition can gradually subside.

Shanghan [Cold Damage] remains unresolved after emesis or purgation, accompanied by infrequent bowel movements and tidal fever. The patient exhibits behaviors such as grasping at clothing and bedrails, fearfulness, and unease, speaking alone as if seeing ghosts. There may be slight panting, fixed gaze, inability to recognize persons, and terrifying manic speech. If, after administering Dachengqi Tang [Major Order the Qi Decoction], the pulse becomes wiry, life is possible; if the pulse is choppy, death is inevitable with no regret. (Zhang Zhongjing stated: After Shanghan [Cold Damage] has been treated with emesis and purgation, if the disease is not resolved, and there is constipation for five to six days up to ten-plus days, the patient develops tidal fever at dusk [Bing Shi], does not fear cold, and behaves as if seeing spirits. In severe cases, upon onset, they do not recognize people, grasp at clothing and bedrails in妄动 [frantic movement], feel fearful and uneasy, have slight panting, fixed gaze. A wiry pulse indicates survival; a choppy pulse indicates death. Zhang Zhongjing stated: For Taiyang Wind Strike [Zhong Feng] treated with fire therapy, the combination of two Yangs scorching the body causes jaundice and nasal bleeding. With behaviors like grasping at clothing, if urination is free, treatment is possible. Hua Tuo stated: Patients exhibiting grasping at clothing seams are incurable.)