As a result of sleep apnea, the deep sleep period is very short or even no deep sleep period, as a result, although the sleep time is quite a lot, but feel tired, sleepy and drowsy all day. In the long run, it will lead to a serious lack of oxygen in the muscles, serious disruption of sleep structure, and can lead to a variety of complications of chronic diseases. The medical term is sleep apnea syndrome (SAS). Currently internationally recognized diagnostic criteria are: more than 10 seconds of apnea per night during 7 hours of sleep, recurring more than 30 times, or an average of more than 10 seconds per hour apnea and hypoventilation more than the sum of the number of times more than 5 times. Hypoventilation is defined as a decrease in the strength of respiratory airflow of more than 50% of the normal strength of respiratory airflow, accompanied by a 4% decrease in blood oxygen saturation. The most common symptom of sleep apnea syndrome is recurrent interruptions of oral and nasal airflow lasting more than 10 seconds during sleep. Chronic sleep apnea can lead to recurrent episodes of hypoxia and hypercapnia, which can cause: cardiovascular disease, hypertension, angina pectoris, myocardial infarction, dilated cardiomyopathy, cardiac arrhythmias, epilepsy, dementia, cerebral thrombosis, strokes, pulmonary arterial hypertension, cor pulmonale, nocturnal asthma, respiratory failure, acromegaly, hypothyroidism. There will also be: reduced secretion of growth hormone, sugar, fat metabolism disorders triggered by diabetes, obesity, frequent urination at night, decreased libido erythrocytosis, proteinuria and other phenomena, the severity of the condition will lead to sudden death! Currently known sleep-related diseases up to nearly 100 kinds.