Hazy Days of Daze: Was it all a dream?

I liked School Daze well enough. It wasn’t one of my favorites, but it wasn’t my least favorite either. The ending didn’t make much sense to me and I couldn’t figure out any reason why Spike Lee would want us to view the movie as a dream sequence, or as separate from reality at all. I think he could have said “Wake up” in other ways. A conversation from Dap to Julian, or Dap to half-pint, or Rachel to Dap, where he still broke the fourth wall, but some internal character/story conclusion was still reached. I was left with confusion, and not the good kind. What happened Spike Lee?