Over-analyzing

Monday morning I woke up at 6:15 AM and for once was quick to get out of bed. What made such miracle happen you ask? a dream, or nightmare, depending how you want to look at it. I had been dreaming that I got a bad grade in my up-coming exam.
Let me give you the story behind it: The grade for the class will be made of 3 exams, one oral presentation and one final paper. The professor told us that he would only take the best two grades we get in the exams, therefore, if we're happy with the grades we get in the first two, we don't have to take the third one. Are you with me so far?
I got a 90% on the first one and so I would like to get at least that this weekend in order to wave the third one.

Back to my dream. I had gotten a 70% and was the only one that had to take the last exam! - I say "had to" because I refuse to get a 70 in grad school- Well, needless to say that I was hitting the books by 6:20 AM...
The funny thing is that one of the main readings we have been doing for this test is about the unfairness of grading, and exams, and any assessment that put pressure on the students - it is called, justifiably so, "Punish by Rewards".

And so why would I be dreaming about it? Am I so gun-ho on proving myself to others? Am I so scared of failure?
This whole psychoanalysis of education thing is driving me crazy (no pun intended), and it's not letting me get my beauty sleep. By the time I'm done with my career I'm going to look like an old, tired hag and cursing the behaviorists for the white hairs and wrinkles I'm getting.

And I refuse to pay a professional to tell me that I worry too much!