I'm sorry you end up like a plant in a knot. I get that now and then in my neck. It HURTS. The old stiff neck from sleeping wrong. Never had the whole body though.
When I can't get to sleep, I re-play old dreams I still remember in my head. For some reason it helps me to fall asleep. I think it's because they were never real, so it isn't something to rev up my brain. If that doesn't work, I go back on my tablet and read my old Steemit posts. THAT works too well. Hope you can find a way without becoming a twister meister. (Though like you said, that sounds fun too...)

I've also heard of counting from 1000 backwards. That works, sometimes. So many remedies, so little good sleep.