It is common for little babies to sweat during sleep, not always a symptom of weakness or physical illness. Many parents think that their children are weak and lack calcium, thus sweating constantly. In fact, a significant portion of children are physiologic excessive sweating. Physiological excessive sweating is mostly seen in the head and neck, often occurring within half an hour after going to sleep, and no longer sweating for about an hour. Infants and young children due to the metabolism, coupled with the children lively and active, some even after going to bed at night is not peaceful, so the head can also be sweating after sleep. The so-called physiological hyperhidrosis, refers to the child’s good development, physical health, without any disease caused by sweating during sleep. Parents are often accustomed to their own subjective feeling to determine the best environmental temperature of the child, like to give the baby more covers, covered tightly. Children because the development of the brain nervous system is not yet perfect, but also in the period of growth and development, the body’s metabolism is very vigorous, coupled with the stimulation of overheating, only through sweating, in order to evaporate the body’s heat, to regulate the normal body temperature.