I am a 22 year old female, not overweight, take no prescrips and am otherwise healthy. For the past several weeks I have been experiencing severe pain in the muscles of my upper left arm while sleeping. It is a deep pain like I just worked out really hard. When I wake up and throughout the rest of the day I experience muscle weakness and dull pain in that arm, especially when I try to raise it. I went to the Dr, and she said that I was just sleeping in the wrong position and cutting off circulation to that arm, but the pain occurs when I sleep on that side, when I sleep on my back or when I sleep on the other side and just lay my left arm on my side. It also occurs less severely when I sleep on my stomach. The pain is affecting my sleep, my ability to function during the day and my relationship with my fiancee. I toss and turn all night long, sleep too lightly and end up in the guest bedroom at 3 am to keep from waking him up all night. I have tried changing sleeping positions, sleeping in non-restrictive clothing/ no clothes, sleeping on the couch and in different beds. Nothing works and I can't take it anymore. I don't think that it is just the wrong sleeping position and am becoming worried. Please help!