Sweating at night when you fall asleep may be due to physiological reasons, such as environmental factors, or pathological reasons, such as hyperthyroidism, tuberculosis, calcium deficiency and so on. 1. Physiological reasons: If you sleep at night in a high temperature environment, the body needs to sweat to maintain the balance of body temperature. 2. Pathological causes (1) Hyperthyroidism: It is an endocrine disease caused by excessive secretion of thyroxine due to various reasons. Due to the accelerated metabolism and oxidation of tissues in the body, it is mainly manifested as an increase in basal metabolic rate, and is often accompanied by symptoms such as enlargement of the thyroid gland, protruding eyes, agitation, excessive sweating, insomnia, etc. Therefore, there may be head sweating while sleeping. Therefore, there can be asleep head sweating symptoms. (2) Tuberculosis: when suffering from tuberculosis, night sweating is one of the typical symptoms, and it is easy to fall asleep at night with head sweating. (3) Calcium deficiency: it is mostly seen in children, and it can lead to sweating while sleeping. It is recommended that in addition to environmental factors, people who fall asleep at night with head sweating should go to a regular hospital in time to clarify the cause, and if treatment is needed, it should be standardized under the guidance of the doctor.