Hot sweating in the upper half of the body while sleeping in winter may be caused by the external environment, or it may be due to yin deficiency. 1. If the room temperature is too high when the patient sleeps, the blanket is thicker, resulting in a high body surface temperature, thus appearing in the winter when sleeping in the upper half of the body sweating, is a normal physiological phenomenon, a little lower the room temperature or a little reduction in clothing can be relieved. 2. 2. winter sleep in the upper half of the body sweating, if you exclude the external environmental factors, traditional Chinese medicine often referred to this phenomenon as night sweats (abnormal sweating after falling asleep, waking up sweating to stop), mostly due to yin deficiency, due to yin deficiency and hyperactivity of yang to give birth to the internal heat, to sleep, then the guard yang (in the surface of the yang qi) from the surface into the surface of the muscle surface is not solid, the heat is aggravated, the steam and the Jin leakage and sweating, the symptom of night sweats. After the appearance of discomfort should promptly seek medical treatment, under the guidance of the physician’s diagnosis and selection of medication, not self-medication, in order to avoid delays in the condition.