If the nose is not ventilated at night, there are usually several factors as follows: 1. The most common factor is infectious, such as upper respiratory tract infection, which leads to nasal congestion at night, especially when a person is lying down, and leads to nasal non-ventilation, usually accompanied by inflammatory secretions, purulent secretions, or clear and yellow nasal discharge in the nasal cavity, as well as dry and itchy throat, pain, or abnormal secretions in the throat. 2, the nose at night is also related to allergic rhinitis, in the night to smell pollen or mites, dust and ash, etc., will appear due to allergic rhinitis and the nose is not ventilated. 3, the nose at night is not ventilated, but also related to respiratory insufficiency, pulmonary insufficiency, in pulmonary insufficiency, respiratory function will appear, such as the nose is not ventilated, or appear breathing weakness, breathing difficulties, night Inability to breathe normally and other clinical symptoms and manifestations.