The physiological changes in blood pressure have a tendency to fluctuate in two peaks and one valley, which means that a patient’s blood pressure tends to be highest between 6-10 a.m. and 4-8 p.m., which is often referred to as the two peaks of the day. A trough is the time of day when a patient’s blood pressure is lowest in the evening and at night, which is often referred to as the trough, or one of the valleys. In addition, blood pressure tends to rise as a person ages, and blood pressure is actually different from moment to moment, and many factors can cause it to rise or fall. Relatively speaking, a person’s blood pressure tends to be low in the state of deep sleep, so a person’s blood pressure has a certain pattern of change.