Wherein the author openly discloses repetitive dreams about missed classes

Following Jeff Harrell's meme about unsolicited dreams, I wish some psychiatrist (audit this, Cruise!) could offer me a drug that keeps me from having recurring dreams. Specifically, I would love to be rid of the recurring softcore nightmare of finding myself forced into taking an exam for a class I rarely attended or thought I had dropped. I haven't taken classes for eight years, and I still experience this dream on a weekly basis. Some even appear to occur during high school. Further fueling the anxiety such dreams cause me is the fact I semi-attended a few classes in college at university. It speaks highly of the overall quality of my college education that I could coast through some classes with little attendance in real life.

Why can't I again experience that trippy dream where I was able to move to any point of my lifetime at will?