Normal human blood pressure has a peak at 6am to 10am and 4pm to 8pm each day, which are the highest.
Normal people’s blood is obvious circadian rhythm, manifested as a double peak and a valley, in the morning from 6:00 to 10:00 and 4:00 to 8:00 p.m. each have a peak, the two time periods of blood pressure is the highest, and in the night time blood pressure drops significantly. It is because of the double peaks and valleys circadian rhythm of blood pressure that most antihypertensive drugs are taken in the morning to suppress the peaks of blood pressure during the day, and at night they are less prone to hypotension.
However, for some hypertensive patients, blood pressure may lose its circadian rhythm and instead the highest blood pressure occurs at night, when antihypertensive medication often needs to be taken in the afternoon to control the blood pressure situation at night.
It should be noted that although there are two peaks of blood pressure, the maximum blood pressure of a normal person will not exceed 140/90 mm Hg. If it exceeds 140/90 mm Hg, it is recommended to go to the hospital, monitor the blood pressure, and, if necessary, carry out 24-hour ambulatory blood pressure monitoring in order to assess the blood pressure situation and help formulate a blood pressure lowering program.