40-year-old women, the body is very hot at night when sleeping may be physiological phenomenon, in addition may also be related to the estrogen level decreased, increased body temperature and other reasons, the need for further examination, so that the doctor to confirm the cause of diagnosis. 1. Physiological phenomenon, high ambient temperature, strenuous exercise before going to bed, drinking hot water or like to eat spicy food, etc. may affect the body, thereby increasing heat dissipation, resulting in the body hot. Physiological causes of body burning last for a short period of time and have no other accompanying symptoms. 2. Pathological factors Decrease in estrogen level: Decline in ovarian function and decrease in estrogen level can cause vasoconstriction symptoms, which are mainly manifested as hot flashes (a burst of heat), chest and facial skin redness, followed by sweating. Symptoms usually worsen at night or after emotional excitement, and patients also have other accompanying symptoms, such as palpitations (rapid heartbeat, often accompanied by panic), insomnia, menstrual disorders and so on. Increased body temperature: Infectious diseases such as upper respiratory tract infections, genitourinary infections, or endocrine diseases such as hyperthyroidism, autoimmune diseases such as systemic lupus erythematosus, and tumors can cause increased body temperature. Increased body temperature can cause the body to produce too much heat, and will cause metabolic enhancement, so there will also be the performance of the body hot. Usually pay attention to the lifestyle, do not go to bed before strenuous exercise, eat less spicy food, if the body hot persists, it is recommended to measure the body temperature under the guidance of the doctor or check the endocrine exclusion of pathological factors, timely treatment and intervention.