Itchy body at night sleep may be caused by mites, or chronic eczema, chronic urticaria, neurodermatitis and other causes. 1. Mites: If daily necessities such as bed sheets, quilts, pillows, etc., are not washed frequently, leading to the gathering of mites, then when you sleep at night, the mites will irritate the human skin, thus causing itching and discomfort. 2. Chronic eczema: Generally, the skin is repeatedly exposed to irritating substances, such as detergent, soap, etc., and it is easy to suffer from eczema again and again, which develops into chronic eczema, and the itching symptoms are obvious when you sleep at night. 3. Chronic urticaria: Patients with chronic urticaria usually have symptoms such as wheals, edema and itching, and the itching is obvious when they sleep at night. 4. Neurodermatitis: the onset of intermittent local itching, gradually aggravated. It is more itchy when it is hot, and due to scratching, the skin is rapidly mossy, and there may be scratches, scabs and hyperpigmentation. It is recommended that patients pay attention to personal hygiene, go to the regular hospital in a timely manner, and follow the doctor’s instructions for reasonable treatment.