The child just fell asleep sweating more may be related to the high temperature, lack of vitamin D, physical weakness and so on. 1. High temperature: If the baby sleeps in more clothes, the quilt is thicker, the room temperature is high can cause the child to sleep sweating. 2. Lack of vitamin D: the lack of vitamin D in the body can also cause the child to sleep more sweat, may also be accompanied by the phenomenon of sleep is not steady. 3. Weakness: If the child is not well, repeated illness, resistance is relatively low, can also cause this phenomenon. There may be other reasons why your child sweats a lot when he falls asleep, so we suggest that you go to the hospital in time, improve the examination to clarify the cause of the disease, and then treat the disease under the guidance of the doctor.