Does blood pressure have a daily pattern? I've noticed that my blood pressure is always lower in the morning than at night.
Answers from Sheldon G. Sheps, M.D.
Blood pressure has a daily pattern. Blood pressure is normally lower at night while you're sleeping. Your blood pressure starts to rise a few hours before you wake up. Your blood pressure continues to rise during the day, usually peaking in the middle of the afternoon. Then in the late afternoon and evening, your blood pressure begins dropping again.
Having an abnormal blood pressure pattern, such as high blood pressure during the night or early in the morning, can mean that you have a health problem. Associated conditions include:
http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/expert-answers/blood-pressure/FAQ-20058115?p=1
