I believe some dreams can be preminitions or reminitions. I had a dream before I started my new high school, that I was walking around checking stuff out. There was this zen garden where people were having a class. Lo and behold, my Religions class actually teaches stuff about zen, while holding class there on nice days. Another strage part was this second floor hallway. There was a big aquariam (god knows why) there. I walked to the end of the hallway where there was stairs. I saw one of my best friends, who I haven't seen in years.
Well, on the first day, I notice the math hallway of the second floor looks exactlly like in my dream (except the aquariam was replaced with a water foutain, hmm). After class I went to walk down the stairs to go to my next class, and sure enough, there was my friend walking up them.