If the nose is not ventilated every night while sleeping, the following two aspects are mainly considered: 1. Affected by the environment, sometimes the weather is cooler in winter and needs to be air-conditioned. Sometimes it is because the indoor environment is very dry and the secretion function of the patient’s nasal mucosa decreases at night, which can easily lead to the patient’s nose not being ventilated. 2. The patient takes a flat position when sleeping, which can easily lead to poor drainage of nasal snot inside the nasal cavity and even backflow of nasal snot, so the patient will have a nose not ventilated. Regardless of which of the above causes, it is necessary to actively treat the symptoms so that the patient’s ventilation will be significantly improved when he sleeps at night, and the patient must ensure that the humidity in the room.