well it depends on the person's belief. and certain times, dreams just happens to be in coincidence of what happens in reality... therefore some feels the sense of deja vu or premonition.
i've had it happen to me many times where... certain dreams translated to reality in some unforunate ways... for instance, i've never really cared for the well known type of dream of if you've dreamt you lose your tooth or teeth, it signifies a horrific incident in your life as death. i've had it happen, i've dreamt that i lost a full mouth of teeth, and suddenly it all grew back in my mouth within minutes. i was just confused in the dream, because it was a strange sense... in reality, about a week or if even after the dream, my maternal grandmother passed away, 2 days after her death, someone close to the family gave birth to her daughter...and i had to suffer in labor with her.
and i've had other several dreams... where it translated into reality in better ways. but i guess it's really up to the individuals beliefs and perspective of things. -_-