When a snoring patient goes to the hospital, the doctor will usually give the patient a sleep breathing monitoring test (PSG), so what can sleep breathing monitoring do for you? As we all know, weak bioelectric activities can be generated by the activities of various parts of the human body, such as EEG generated by brain activities, eye movements when the eyes are moving, and cardiac electricity, etc. These bioelectricities are guided at the corresponding parts and amplified through certain amplifiers and input to the computer for storage. At the same time, some indicators related to sleep breathing, such as nasal airflow, snoring and mechanical movements such as chest and abdominal activities, are also converted into electrical activities and input into the computer. The computer can store these indicators in memory, and we can make a diagnosis, estimate the severity of the lesion, and estimate the prognosis of the monitored person based on the size of these data and the relationship between them. The clinician can then make a comprehensive assessment of the patient’s sleep, make a diagnosis, estimate the prognosis, develop a treatment plan, etc. So what kind of people should have a PSG test? Strictly speaking, it is better to monitor all people who snore during sleep, but there are too many such people, and it is not necessary to monitor all of them. However, if you have symptoms such as breath-holding during sleep, drowsiness in the morning, memory loss, low work efficiency, unexplained hypertension, premature beats, arrhythmias and impotence, you should be examined as soon as possible.