Five-year-old children sleep a lot of sweat, common causes are environmental factors, vitamin D deficiency, excitement state. 1. Environmental factors: children’s metabolism is vigorous, easy to sweat, such as indoor temperature is too high or the child’s bedding is too thick, resulting in abnormal thermoregulation center, sweat can not be discharged in a timely manner, can be sweaty when sleeping, parents can be adjusted through the appropriate indoor temperature, reduce the bedding and so on to improve the way. 2. Vitamin D deficiency: If the child’s excessive sweating is accompanied by night terrors, chicken chest, funnel chest and other manifestations, it suggests vitamin D deficiency. 3. Excitement: If the child is over-excited before going to bed, the child’s sympathetic nerves will still be in a state of excitement after sleep, and the symptoms of excessive sweating will appear, therefore, it is not recommended that the child has too much exercise or is over-excited before going to bed. In short, when the child sleep excessive sweating, it is recommended to timely pediatric consultation, clear cause, take targeted treatment.