I have also read that abuse sufferes have difficulty relaxing. It's like you're always prepaired to flight or fight, I guess.

I have trouble relaxing too, but I don't know why. I tend to clench my jaw and give myself headaches if I'm not careful. I'm always on edge and it's hard for me to just be calm. I can sleep even though I can't relax, but I don't rest. The thing that keeps me awake is racing thoughts.