Itching all over the body after lying in bed is mostly caused by scabies, eczema and hives. It is necessary to consult a doctor in time to clarify the cause of the disease. 1. Scabies: It is a parasitic skin disease caused by scabies infection of the skin, and is mainly transmitted through skin contact. It is usually accompanied by intense itching, especially at night, so after lying in bed, itching all over the body may be caused by scabies. 2. Eczema: a variety of internal and external factors caused by skin diseases, lying in bed after the symptoms of itching is usually the body of certain bedding products allergies. 3. Urticaria: a common allergic disease, is the body after contact with certain allergens caused by an allergic reaction, may be in contact with the bed mites, or induced by temperature changes. Itchy body after lying in bed may also be other diseases, it is recommended to consult a doctor in a timely manner, a clear diagnosis.