Sleeping itchy all over the body may be related to the bed, scabies, dry skin and so on. 1. Bed: If you don’t wash the bed sheets for a long time, it will breed bacteria and mites, causing obvious symptoms of itchy skin when you sleep. 2. Scabies: It is caused by human scabies parasitizing on the human body. Scabies can cause mechanical irritation to the body when it moves in the stratum corneum, and the excretions, secretions, and corpses it produces can also cause an allergic reaction and make the skin itchy. 3. Dry skin: some patients have dry skin or pruritus in old age, and bathing with hot water before going to bed can make the skin oil decrease, causing the skin to be drier and appearing itchy skin while sleeping. Appear to sleep all over the body itching, it is recommended to seek medical attention in a timely manner, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.