A lying down nose is not ventilation can be seen in the physiological turbinate cycle, but also in simple rhinitis, vasomotor rhinitis, sinusitis, nasal polyps, nasal sinus swelling and other diseases. Patients should consult a doctor in time to clarify the cause of the disease and then treat it. 1. Physiological turbinate cycle: also known as nasal cycle, normal people on both sides of the lower turbinate mucosa in the volume of blood vessels were alternating and regular contraction and expansion, mostly manifested as lying down unilateral nasal congestion, which can lead to sleep repeatedly turn over, help to lift the fatigue of sleep. 2. Pathological reasons: simple rhinitis, vasomotor rhinitis, sinusitis and other patients, because of the chronic inflammation of the nasal mucosa, often manifested as a lying down on the nasal congestion, but also can be accompanied by sneezing, sniffing, loss of smell and other symptoms. Nasal polyps, nasal sinus swelling and other patients, often due to lying down after polyps or swelling tissue blocking the nostrils and cause no ventilation. It is recommended to go to the hospital for further examination. Once there is a lying down the nose is not ventilated, it is recommended to go to the hospital as soon as possible to the Department of Otorhinolaryngology for further examination, to be clear after the cause of the continued treatment.