I have high BP which is under control (115/69 ) usually when I take it in the AM. However this past week I have been awaken from sleep from pounding blood pressure in my head which usually is accompanied with a headache. When I put another pillow on my other one so that my head is upright, it subsides after 1/2 an hour. So it seems I can't go to sleep with my head totally horizontal. Any thoughts on this?