The human mind is a very busy and active thing. It stores up all sorts of information and then allows pieces to come out in daydreaming or even in dreams at night. Just because a person isn't thinking about a certain event or wish just before bed doesn't mean it won't show up in a dream. Something that happened to me days ago may show up in some form in tonight's dreams. Even if that happens, that doesn't mean it's important in my life.
P.S. "Psychic" is the correct spelling.
P.P.S. I'm guessing you are very young.