The Mohawk Indians believed that dreams were very important and felt what you dreamed were things a person's soul was wishing would happen. They felt that anything a person dreamed would happen in real life. Dreams would guide their lives. They even made "Dream Catchers" that you can see today that were designed to catch bad dreams and let good ones in.
I'm sure they believed in many other things, but dreams were a big one for them. I often come in situations where I'm certain I dreamed the exact situation earlier at a very detailed level. My friends have the same thing happen to them too, so maybe there is something to it all...