Sleeping at night on one side of the nose, normal during the day, may be a normal physiological phenomenon, but also may be related to rhinitis, sinusitis, nasal cavity swelling and other diseases. It is recommended to go to the ear, nose and throat department of the hospital in time for a clear diagnosis. 1. Physiological phenomenon: often manifested as alternating nasal congestion in both nostrils, generally 2-7 hours a cycle, known as the nasal cycle or physiological turbinate cycle, the significance of which is to prompt the sleep to turn over, which will help to relieve the fatigue of sleep. 2. Pathological phenomenon: if the patient has chronic rhinitis, allergic rhinitis, nasal swelling and other dissolved diseases, congested and edematous nasal mucosa, hypertrophied nasal turbinates, swelling and other easy to block the nasal cavity under the action of gravity and cause one side of the nose at night. In short, sleep at night on one side of the nose, daytime normal patients, should be timely to the hospital otorhinolaryngology department for a clear diagnosis, under the guidance of the doctor to choose a reasonable treatment.