Sleep apnea syndrome, which is often seen in psychiatric clinics, is not a psychiatric category. Normally normal people also snore after too deep sleep, fatigue or alcohol consumption, and it should not be considered as a pathology. However, in general, if snoring is very loud, accompanied by breath-holding, daytime drowsiness and memory loss, the possibility of this evidence should be thought of. People often think that snoring is a good sleep, but some people sleep so much that they never wake up again. Now research has proven that a significant number of them are suffering from sleep apnea syndrome. The syndrome can be divided into: obstructive apnea syndrome, central apnea syndrome, and mixed apnea syndrome. The obstructive sleep apnea, caused by the obstruction of the upper airway during sleep, is characterized by the cessation of airflow in the oral and nasal cavities while the thoracic and abdominal breathing movements are still present. Central sleep apnea, in which the airflow in the oral and nasal cavities and the thoracic and abdominal respiratory movements stop at the same time. It is mainly due to the dysfunction of the respiratory center of the central nervous system or the lesion of the nerve or respiratory muscle that innervates the respiratory muscle. Mixed sleep apnea, in which both of these coexist. Obstructive sleep apnea is mainly caused by obstruction or narrowing of the upper airway during sleep. Therefore, narrowing or obstruction of any part of the airway, from the anterior nostril to the upper trachea, may lead to apnea, such as various nasal diseases, nasopharyngeal diseases, oropharyngeal diseases, hypopharyngeal diseases, and oral diseases. Other diseases such as pathological obesity. Central sleep apnea can be observed in the elderly or infants during sleep, and can be considered as a central cause. Central sleep apnea can also be seen in normal adults during fast-acting sleep phase or in plateaus. etc. The onset of sleep apnea syndrome is a gradual process, often the result of several etiological factors, especially in weight gain, old age, upper respiratory tract infections, heart disease, supine sleep, alcohol consumption and sleeping pills. The clinical symptoms are mainly due to narrowing and obstruction of the airway and the secondary decrease of blood oxygen saturation. The main ones are: snoring, loud snoring, irregular snoring and intermittent snoring, when it is apnea period. Extreme daytime sleepiness. Patients can fall asleep immediately without control, sometimes during meetings, at work, while talking with each other, or while eating. Abnormal behavior can occur, and patients often wake up with a start, sit up suddenly, sweat profusely, and have a sense of near death. The patient often has tapping-like limb movements and sleepwalking during sleep. Headache, mental and memory impairment, and a tendency to misbehavior and mental disorders. Increased nocturia or nocturnal enuresis, sexual dysfunction. Tend to cause and aggravate hypertension, coronary heart disease, heart failure, arrhythmia, stroke, etc. Sleep apnea syndrome can cause severe respiratory distress to the point of asphyxiation, and there will be varying degrees of hypoxia. If there is heart disease it can cause respiratory failure and heart failure leading to sudden death at night. Having the disease makes the quality of life significantly worse and it also affects the lives of others. With polysomnography, snoring and apnea during one night’s sleep are checked, and data from various aspects such as sleep quality, hypoxia, ECG and EEG are combined and analyzed. It is possible to determine the diagnosis and severity. Patients in this category should first make life adjustments: first of all, they should have a balanced diet, live a regular life, exercise properly and control their weight effectively. Change the sleeping position, such as lying on the side, high pillow lying. Do not smoke or drink alcohol, do some recreational activities appropriately, but avoid fatigue. There is not a really effective drug yet. Some people can achieve results with surgical treatment. Mild cases can be treated with positive pressure breathing (difficult to maintain for a long time) or oral orthoses to improve ventilation. Moderate and severe cases are treated with a simple ventilator that is effective in most patients.