Sleeping at night with a lot of sweat may be physiological reasons, Yin deficiency, dampness and heat and other factors. 1. Physiological reasons: such as the summer environment is hot, the blanket is too thick or covered more tightly, easy to lead to the body does not breathe and thus smothered a lot of sweat. 2. Yin deficiency: symptoms such as dry mouth, dry eyes, dry tongue, etc., indicate that the patient’s body is not enough Yin fluid leading to Yin deficiency. Yin deficiency to a certain extent will appear night sweating (abnormal sweating after going to sleep, waking up sweating stops) performance, night sweating will generally appear in sleep, such as the night sleep sweaty situation. 3. Dampness and heat: some patients sweat a lot at night, most of them do not sweat in sleep, most of them have dampness and heat in the body before sleep, which causes heavy dampness, coupled with fire in the body, which is more irritable and leads to a lot of sweating in bed at night. It is recommended to exclude the physiological causes, if the night sleep a lot of sweat for a long time failed to relieve, it is recommended to timely medical treatment of the cause.