Every time you sleep itchy body can be seen in normal people, but also may be contact dermatitis, pruritus and other diseases caused by such people should consult a doctor in a timely manner, to clarify the cause of the disease. 1. Physiological conditions: normal people in a long time without changing the bed sheets and covers, no bath time will be very itchy every time you sleep, such people should pay attention to personal hygiene, to maintain the necessary cleanliness. 2. Contact dermatitis: every time you go to bed itchy body may also be caused by contact dermatitis, patients in the onset of more than the use of newly purchased bedding, resulting in rashes, itchy nose, sneezing and other symptoms, you should actively search for allergens and avoid re-exposure. 3. Pruritus: every time you sleep on the body is very itchy may also be caused by pruritus, the patient will also have a burning sensation of the skin, ants crawling sensation, mostly due to dry skin caused by the night bath after applying moisturizing cream, relieve the symptoms. There may be other reasons to cause the above situation, it is recommended to go to the hospital in time, clear diagnosis, symptomatic treatment.