This has bothered me since my first high school term paper. I cannot write until late and simply go to bed. My mind explodes with ideas, conflicts, and characters. I have to spend at least an hour with something vanilla, like Leno or the weather on TV. I can't even read because it takes mental focus, and that will get me recharged. No sleep after that. Toss and turn. Do you have to wind down and get away from your project to have a peaceful sleep?