Sweating at night can be caused by high ambient temperature, calcium deficiency, tuberculosis infection and so on. 1. High ambient temperature: mostly seen in summer, mainly because of the high indoor temperature, which will lead to sweating or cover the quilt is thicker, also easy to lead to sleep sweating, is a normal phenomenon. 2. Calcium deficiency: children’s growth and development is more vigorous, it is easy to lead to calcium deficiency, and in calcium deficiency, it is easy to lead to sympathetic nerve excitation, so it is easy to sweat at night. 3. Tuberculosis infection: mostly seen in tuberculosis, often lead to sweating during sleep, mostly accompanied by low fever, cough, etc., sweat is usually more. Small children sweating at night, if you exclude the normal phenomenon, it may be caused by pathological reasons, you should take your child to the hospital in time to find out the cause of the problem, and then targeted to take treatment.