Dream A Little Dream

Is it weird to dream about people you haven't seen in years? Last night I had a dream about someone I haven't seen since my freshman year of college.

But the thing is, the dream was in real time. I was my current age. I looked like I do now, not like I did then. (Although maybe it was really a nightmare since I'd give anything to be as skinny as I was just out of high school.)

The dream was pretty vivid and the setting was a house I lived in while in high school, which is three locations ago if you count dorming for a year in college. I haven't even been back to that house for at least five years, probably more. I don't remember exactly when we moved out of that place.

What do you suppose it means, to dream about someone from your past? Is it some kind of premonition? Is is nostalgia manifesting itself when you're most likely to let it in? Is it your subconscious taking a tally of your life, then and now? Is it just reliving your history?