T.W.
I had one of my children do this (the first actually). It is very difficult to have a good night sleep with an older child kicking and thrashing like they do. Ultimately I did not find a solution, I actually had several of my friends tell me to just wait it out and he would stop at around 9. They were right, within a month or two of his 9th birthday, he went to his room and stayed there.
I wish I had a better solution for you, but thought this info might help at least.
Good luck!