Children itch all over their bodies at night, and common causes include insect bite dermatitis, prickly heat and scabies. 1. Insect bite dermatitis: If the bedding has not been replaced, cleaned and dried for a long time, resulting in mites breeding in the bedding, children’s skin is relatively delicate, lying in bed at night, when the mites bite, can lead to itching all over the body. 2. Prickly heat: Mostly seen in summer, at night when children sleep with the back of the sheet contact sweating, but not easy to dissipate heat, resulting in small sweat glands clogged, thus triggering prickly heat, which can lead to itching all over the body of the child. 3. Scabies: Scabies is mainly caused by scabies infection, itching is more intense at night, children will feel itchy at night. If children itch at night, they should go to the regular hospital to find out the cause of the disease, and choose the appropriate method of treatment under the guidance of a professional doctor.