The study will consist of two visits to the Hospital of the University of Pennsylvania (HUP). Two devices will be applied for 24 hours. The 1st device is called the ambulatory blood pressure monitor (APRM) and the 2nd device is the actigraph activity recorder that is placed on your wrist area. Those who do not have lower blood pressure at night may be invited to participate in Part 1 of this study which includes a separate consent form.
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