I know just how you feel. Whenever I tire myself out too much, my muscles will spasm all night and disturb my sleep terribly. Baclofen helps a little, but makes me sleep for 12 hours straight and then feel groggy the next day. I've found that a hot rum toddy works much the same and doesn't make me feel as awful the next day - go figure!
I've cooked all day, but I did it in easy stages and rested in between. I'm relaxing with my wine now and I feel pretty good.
I hope that the medicine helps you and that you can get some good rest tonight.
Take care of yourself, and Happy Thanksgiving!