I am wondering if anybody would have any information about the position of your body when taking your blood pressure reading at home with a wrist monitor. The instructions say to sit with back straight and hold your arm at heart level. I lay down and hold my arm at heart level. I mean, they take your pressure laying down at the hospital, so why wouldn't it be ok at home? Why would the position of your body / laying vs. sitting / affect the results? Thanks very much!

Sit straight with your arm below heart level, like resting on an arm rest of the couch or in your lap. Lying down will give you a much lower and inaccurate reading.