Dream, Part 1

So, have you been to a place or met somebody or found yourself in a situation and suddenly thought, "oh, wait a minute, I've already been here or done the same thing...but it was in a dream!!" Strange feeling, really, but also sort of makes you feel "gifted" . I have had this wonderful feeling many a time,and I truly felt "special" but also confused a little. Ive had dreams about things I was going to be doing, people (I already know) I would be meeting, places I was going to be in....but what does this mean?