Yesterday I had a pinched nerve in my neck. I couldn't bend over enough to keep from scraping my head on the car when I got in. I couldn't turn or bend or lean to one side or the other. I used the electro therapy and a heating pad off and on all day.
Last night I slept in whatever position I managed to collapse into. This morning it was fine! I don't know if I did something that helped, or if it just worked its way loose.
I was really happy to have some flexibility back.