Why high school?

You all know about my sleep issues...but perhaps not about my dream issues. You see, I have this recurring dream/nightmare that I am back at my high school because I haven't finished something. I graduated 16 years ago! Why in the world do I keep thinking that I need to go back to MCHS to finish something left hanging so long ago? It is so strange. I see my teachers in the hallway, I feel myself walking into the front office because someone is calling me in to tell me what I'm missing. They might revoke my diploma which could somehow undermine my bachelors and masters degrees! It's just the strangest dream. Once I thought I'd finished it. I had a dream a couple of years ago that I met with a panel of teachers and they signed off on my last assignment. I remember one of them saying, okay that's it, you're all done! When I woke I felt instant relief. But now, a couple of years later, the dreams about not finishing high school have started anew. Does anyone out there have any idea what this is all about? Sometimes it's a math problem I need to solve, an english paper I still need to write, or some kind of standardized test I still need to take. I just can't figure out what this dream sequence means for my subconscious. I've actually taken my diploma out of the drawer of my nightstand to look at it and verify that I finished high school! Hmm...let me go find that thing right now and I'll just sleep with it curled in my arm. Maybe that'll help.