Physics

Don't get me wrong, i LOVE physics, but after tonight's midterm exam i am completely spent. i don't want to do anything. i don't know why but i am completely spent, all i want to do is relax and all i can do is dread the fact that i have to do work for the rest of the week. I hope this feeling goes away by morning, all i want to do is be productive and enjoy my days, not loathe them. On a bright note..I'm pretty sure i aced the exam-what i can't figure out however..is why I'm so drained... =/