After several nights of no sleep due to nightmares, last night I finally "crashed and burned" (fell asleep for several hours). When I awoke, I had clenched my blanket so tight for hours that I had a hard time relaxing and unbending my arms. My arms are very sore today; every time I try to move them it's painful. This is just about as bad as no sleep! Anyone else have this problem or know what to do to avoid this????