Patients with nosebleeds while sleeping may be the signs of local nasal cavity diseases and systemic diseases, as follows: 1, Some patients may also have obvious deviation of the nasal septum, or polyps, papillomas and other proliferative conditions in the nasal cavity, which may also cause nosebleeds; 2. There may be significantly elevated blood pressure, or coagulation disorders, blood system diseases, which may lead to the sudden occurrence of bleeding symptoms, if necessary, further improvement of the examination.