Wow! I totally get worked up before therapy as well,but for me its a build up of anxiety as the session approaches.I too have had the restless sleep the night before.Fitfull sleeps.Nightmares too.
Therapy has never been that pleasurable for me and Ive never looked forward to one ever.Mabie my therapist sucks and I dont have much to compare him to.
Im a pro at avoiding....I think thats what gets to me......now I have to deal with the stuff I avoid.
Thinking good things,stay strong..Take care.