For about the last month I have been having nightmares to the point of waking up in a sweat. Usually I sleep very well but at least once a week or up to three days a week I have a pretty bad nightmare. Sometimes my heart rate is very high or I fling open the door only to snap out of it seconds later wondering why I am doing what I am doing. I didn't really think of it until I notice that I had been having them for a while when at one time I had almost none. I really can't remember anything about the nightmares besides the waking up part.