Sweating during sleep can be caused by environmental factors, calcium deficiency and autonomic dysfunction. 1. Environmental factors: If the temperature in the room where the child sleeps is too high, or the blanket is too thick when sleeping, it may cause the child to sweat when sleeping. 2. Calcium deficiency: As children grow faster during the growth period, a lack of calcium in a child is likely to result in increased neural excitability, which may lead to sweating while sleeping, and may be accompanied by symptoms such as crying and irritability. 3. Autonomic dysfunction: If the child is stimulated by the outside world during the day, it may lead to cerebral cortex over-excitement caused by autonomic dysfunction, which may also cause the phenomenon of sweating in the child’s sleep. If the child sleep sweating is caused by disease, parents should take the child to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of professional doctors to take targeted treatment.