Sleeping at night with no ventilation in the nose may be caused by acute rhinitis, chronic simple rhinitis, allergic rhinitis and so on. 1. Acute rhinitis: acute inflammation of the mucous membrane of the nasal cavity caused by viral infection, congestion and swelling of the mucous membrane of the nasal cavity and turbinate, and the appearance of the nose is not ventilated. At night when sleeping due to parasympathetic nerve excitation, the nose is more serious than during the day. 2. Chronic simple rhinitis: intermittent or alternating nasal congestion is one of the main clinical symptoms of this disease, and the symptoms of nasal congestion are generally lighter during the daytime and during exercise, and heavier at night and during rest. Because of daytime exercise, generalized autonomic nerve excitation, nasal mucosa vasoconstriction, nasal congestion is reduced, and at night when you sleep, the nose is not ventilated seabass lying down with the internal jugular vein pressure increased. 3. Allergic rhinitis: mostly in the alternation of seasons, especially in the spring and fall attack obvious, patients mainly manifested as nasal congestion, nasal itching, paroxysmal sneezing and other symptoms, sleep at night indoor presence of allergens, such as dust mites, etc. will lead to the nose does not ventilate. The symptoms of nasal congestion while sleeping may also be caused by nasal polyps, deviated septum, nasal sinus tumors, etc. It is recommended that the patient consult a doctor in a timely manner for relevant examinations, and after a clear diagnosis, then carry out targeted treatment, so as not to delay the condition.