It is not normal for a toddler to sleep in a profuse sweat, which may be caused by environmental factors, such as too high temperature, too thick bedding, etc., and disease factors, such as vitamin D deficiency rickets, tuberculosis, and other etiologic factors. When young children sleep at night, if the ambient temperature is too high, the bedding is too thick, and the amount of exercise before bedtime is too much, it will lead to physiological sweating, which is a normal phenomenon. When suffering from vitamin D deficiency rickets, there will be symptoms of excessive sweating, accompanied by irritability, alarm, irritability and other symptoms; tuberculosis will also have night sweats, tuberculosis will be accompanied by coughing, coughing up phlegm and other respiratory symptoms, renal tuberculosis will be accompanied by urinary pain, urinary frequency and other symptoms of the urinary system. If a young child has a sleepy and sweaty appearance, in the exclusion of environmental factors, it is recommended to go to the hospital in a timely manner to consult a doctor.