Itchy body while sleeping may be caused by physiological factors such as dry skin, or it may be caused by diseases such as scabies and hives. 1. Dry skin: If the weather is too dry, it may lead to a faster loss of water in the body, resulting in dehydration of the skin, which may lead to an itchy body while sleeping. 2. Scabies: the cause of the disease is mainly related to scabies mites parasitizing the human epidermis. Mainly manifested as pimples, blisters, itching and other symptoms, usually, the scabies mite is usually active at night, so the degree of body itching while sleeping will increase significantly. 3. Urticaria: The cause may be related to food, infection, mental and other factors. The patient’s skin will be itchy, and the itchy parts will also appear in different sizes of wind bumps, which may occur every day or intermittently, and may cause the body to itch when sleeping. There are more causes of itchy body while sleeping, after excluding physiological factors, it is recommended to go to regular hospitals for medical examination to clarify the cause of the disease.