Snoring is a common phenomenon in human sleep. We usually think that "snoring" means that the person sleeps soundly. However, this is not the case. People who snore may have suffered from a sleep disorder - sleep apnea hypopnea syndrome (OSAHS). People suffering from this disease will suffer from apnea / hypopnea during sleep, which will cause severe hypoxia throughout the body, lead to cardiovascular and cerebrovascular diseases, and even death during sleep. We also call it a "killer in sleep" in medicine. Sleep apnea hypopnea syndrome is so harmful. To what extent should snoring be investigated and treated? Generally, when snoring has the following characteristics, we recommend to come to the hospital for investigation: 1. The tone of snoring exceeds the tone of our usual speech; 2. Irregular and intermittent snoring; 3. Excluding factors such as staying up late and working overtime, after 7-8 hours of sleep, the patient still felt obvious fatigue and dizziness the next day, "unable to lift up the spirit". The screening of sleep apnea hypopnea syndrome is very simple. It can be clearly diagnosed only by "sleep breathing monitoring". The advantages of this examination are non-invasive, painless and radiation-free. Patients only need to wear sleep breathing monitors for 7-8 hours. They can even take the monitors home for monitoring, which will not affect the rest of patients, At the same time of monitoring, the severity of sleep apnea hypopnea syndrome can also be graded (light / medium / severe). Doctors need to formulate personalized treatment plans for different degrees of sleep apnea hypopnea syndrome, reduce the risk of cardiovascular and cerebrovascular diseases and improve the quality of life through effective treatment. (outlook new era)