This is called systolic pressure . When the heart is at rest, in between beats, your blood pressure falls. This is the diastolic pressure . Blood pressure is always given as these two numbers, the systolic and diastolic pressures. Both are important.
Blood pressure changes during the day.
It is lowest as you sleep and rises when you get up. It also can rise when you are excited, nervous, or active. Throughout the day, blood pressure can vary. Still, for most of your waking hours, your blood pressure stays pretty much the same. And, with high blood pressure, the heart has to work harder and you are at an increased risk of a stroke, heart attack, and kidney problems.