A child sweating profusely as soon as he or she goes to bed may be a physiological phenomenon or may be caused by disease factors. 1. The child is young, the metabolism is relatively vigorous, if you drink a lot of water before going to bed, eat water-rich food, sleep environment temperature is too high or strenuous activities before going to bed, there may be a full head of sweat phenomenon once you go to bed. 2. If the child suffers from rickets, there will be night terrors, excessive sweating, irritability; or if the child suffers from tuberculosis infectious disease, there will be low fever, night sweating, emaciation and other manifestations of these diseases will also lead to the phenomenon of sweating in the head when the child sleeps. If you improve the temperature of the sleeping environment, and still a full head of sweat in bed, you should take your child to the hospital in time to improve the relevant examination, to clarify the specific causes, and give appropriate treatment for the causes.