I certainly hope it will improve when (if) I ever get stable again, but I can't speak to that yet. For me sleep has historically been largely mood-related.

I do get this weird feeling in my head that I can't quite describe, but when I feel it I know I'm not going to be able to sleep. It's not pain but it's a kind of dull feeling mixed with the sensation that my mind is "switched on" somehow. I guess that's too vague to get any kind of point across but I really don't know how to describe it better.