I have dreams before big events happen...such as 9/11. 4 days ago, I nada dream that I was with family, and we were close, in our old family home, and the sky was on fire. Just now, woke up from a dream. Our family was together....an event already occurred, the world was changed forever, we were asking ourselves why....at this point, are we still in NYC. Then at this point, I saw a religious figure run panicking down a hill. Before this point in the dream, CNN was showing a map of an object from space headed toward the US and closed in on the NYC area. It was truly horrifying, and I just wanted to know if anyone could relate to this.
Dreams about accidents, disasters and things like the sky being on fire are quite common and probably related to emotions you are feeling and things that are going on in your life or have happened in your past. It's possible that what you are experiencing is Selective Memory - You hear about something on the news like 9/11, and then you think about the dreams you had recently and you remember the dream you had about a fire or a plane crash (both very common dreams, by the way). Another time, you dream about a plane crash, for example, but your life goes on as normal so you don't think about your dreams and you quickly forget about that one. Also, if a terrible catastrophe happens in real life, and you don't happen to have a catastrophe-related dream, you don't think about it. You only think about the times when you had a dream about a disaster and a disaster really happened, not the times when you had a dream about a disaster and nothing happened, or a disaster happened and you didn't dream about it. It also depends on your definition of a "big event". 9/11 was unique but lots of accidents and natural disasters can happen more often than you realize, so statistically it is not that unlikely that you will have a disaster-type dream and then a similar disaster will happen in waking life. You might want to read about precognitive dreams and disaster dreams.