The latest epidemiological survey shows that the incidence of hypertension in China is increasing year by year, and the rate of regular medication and good blood pressure control after the onset of the disease is worrying. The number of adults over 18 years old with hypertension in China is about 160 million, of which only 6.1% have their blood pressure effectively controlled. Although many hypertensive patients have been diagnosed and are taking antihypertensive medications, their blood pressure is often not well controlled for a variety of reasons, including poor control of blood pressure at night. Therefore, it is especially important to raise awareness of the characteristics of hypertension and improve the rate of blood pressure compliance to reduce the occurrence of heart, brain and kidney diseases. Human blood pressure has a typical circadian rhythm, in most cases it is “low at night, high during the day”: that is, the blood pressure level is low at night, in the “trough”, and after waking up in the morning, human blood pressure begins to gradually increase, reaching the “peak” at about 10-12 a.m. “After that, the blood pressure decreases, but it remains at a high level during the day. In the evening, the blood pressure gradually decreases and reaches its lowest point at 3-5 a.m., showing an “aryeplate” pattern (see the figure below), with a variation of more than 10%. Medical studies have shown that systolic blood pressure in young people can rise by about 20-25 mmHg in the morning; and in older people with atherosclerosis, the change in systolic blood pressure is more pronounced, with changes of up to 50 mmHg or more in the hours from early morning sleep to waking. Note: The 24-hour systolic blood pressure change in a case of normotension, the yellow part of the graph shows the decrease in blood pressure in the early morning, which is lower than the average blood pressure level during the day (red dashed line), compared with the blood pressure during the day, which is presented as “ladle and shank” respectively. In recent years, some scholars have studied the temporal rhythm of blood pressure in patients with hypertension, and found that some hypertensive patients lost their blood pressure drop in the early morning hours and even had a higher blood pressure than the daytime blood pressure, showing a “non-ladle type” (blood pressure drop ratio).