The first reason to consider the itchy body at night while sleeping is whether there is the growth of certain parasites on the body, such as the impact of mites and other stimuli. Also consider that as we age, drier skin, thinner skin and poorer nutrition may also be causing the onset of itchy symptoms on the body. If it is also accompanied by itching, pain, or a rash on the body, it may be necessary to consider whether there is an attack of neurodermatitis on the body. At this point, you need to consult a doctor and may need to take certain anti-allergy medications for treatment, as well as keep your body clean and dry to relieve the symptoms of itchiness on your body.