Special Laboratory Tests

Sleep disorders have become a prominent medical and public health problem. Nearly 18 million people in the United States suffer from sleep disorders without effective treatment, accounting for about 6% of the population. Up to 42.7% of China’s 1.3 billion people suffer from sleep disorders. There are more than 90 sleep disorders in the international classification of sleep disorders. Insomnia, sleep respiratory disorders, restless regression syndrome, and excessive daytime sleepiness are the most important sleep problems. They are not only the triggers of many errors and accidents, but also the triggers of cardiovascular and cerebrovascular diseases such as hypertension, diabetes, coronary heart disease, and stroke [1–4]. Polysomnography is the most important method to diagnose and study sleep disorders.