The bleeding of the nose after waking up is considered to be dry rhinitis, nasal septum deviation, high blood pressure, and so on. 1. Dry rhinitis: it may be due to the indoor air is too dry when sleeping at night, mostly seen in the northern heating season, such as dry rhinitis, nasal mucous membrane secretion is reduced, the mucous membrane is dry, the capillary fragility increases, and often have this symptom of nosebleed. 2. Nasal septum deviation: generally mild nasal septum deviation is not easy to cause nosebleeds, but if the nasal septum deviation is more serious, it may lead to one side of the nasal septum mucous membrane respiratory impact, so the phenomenon of bleeding. When the difference between the ambient temperature and the temperature of oneself after waking up is large, the mucous membrane can be ruptured and bleed at the prominent part of the deviated septum. 3. high blood pressure: when the blood pressure suddenly increased, often lead to increased pressure of blood vessels in the nasal mucosa, resulting in blood vessel rupture leading to bleeding, may be due to high blood pressure in the morning when you wake up. Wake up bleeding nose may also be due to other reasons, it is recommended to go to the hospital in a timely manner to identify the causes of targeted treatment.