Children sleep hair sweat all wet may be because of environmental discomfort, rickets, metabolism and other reasons. 1. Environmental discomfort: air conditioning temperature is too high, the bedding is too thick, will lead to poor air circulation, thus affecting the child’s breathing condition, resulting in the phenomenon of sleeping hair sweating wet. 2. Rickets: rickets is caused by the lack of vitamin D and calcium, vitamin D promotes calcium absorption, the lack of vitamin D can lead to insufficient absorption of calcium in the body, the lack of calcium can cause sympathetic excitation, affecting the secretion of the sweat glands, which will cause the children to sleep with sweaty hair all wet. 3. vigorous metabolism: the child’s body is in a period of growth and development, the metabolism is more vigorous, so there will be sleeping hair sweating all wet situation. It is recommended to closely observe the child’s physical condition and go to the hospital in time for relevant examinations.