Sweating while sleeping may be caused by environmental factors, rickets, fast metabolism and other reasons. 1. Environmental factors: may be due to the hot weather, or quilt cover too much caused by the boy’s body temperature rises, thus causing the phenomenon of sweating. 2. Rickets: it is a kind of chronic disease mainly characterized by bone lesions caused by abnormal calcium and phosphorus metabolism and ossification disorder due to various factors. Due to the disorders of calcium and phosphorus metabolism caused by vitamin D deficiency, sympathetic nerve excitation occurs, which can appear the phenomenon of excessive sweating. 3. Fast metabolism: because the child’s skin water content is larger, and the skin surface layer of the microvascular distribution is more, the metabolism is faster, which can appear sleep sweating phenomenon. Suggest that often sleep sweaty boy, exclude physiological factors, go to the hospital in a timely manner, in accordance with the doctor’s instructions for treatment, to avoid delaying the condition.