Snoring is due to a local narrowing of the upper airway during sleep. This principle is like the game of willow branch bark making sound, the willow branch draws off the core, leaving only the empty tube, we partially flatten the empty tube and blow at one end, it will make a crisp sound. Snoring is also the same reason, the rapid airflow in the airway during sleep, flowing through the narrow part of the upper airway, causing the soft tissue of the airway wall to vibrate thus producing sound. Due to the Bernoulli effect, the airflow velocity at the stenosis is further accelerated, making the local laminar flow decrease and turbulence increase, creating an inward collapse force on the narrowed local mucosa and further aggravating the airway stenosis. This is a dynamic process in which the rapid passage of airflow through the narrow lumen produces the snoring sound we hear. Snoring is something that needs to be taken seriously. Snoring with recurrent apnea and hypoxemia can induce hypertension, heart disease, stroke, diabetes and many other medical system diseases. If your family member has the following problems, it suggests that he may suffer from sleep ventilation disorder: snoring, breath-holding during sleep, occasional awakening from suffocation, discomfort such as dry mouth, dry throat and itchy throat after waking up in the morning, headache after waking up in the morning, and feeling that he is not relieved after sleep. Daytime drowsiness, poor work efficiency, memory loss, irritability, etc. At this point, we need to perform a series of accurate and objective tests to assess his sleep status, and one of the necessary assessment tools is polysomnography.