“Last night I dreamed about you” is an even more alarming phrase because in it the dreamer shares something so intimate with you that it is scary. When a writer tells a character's dream in a novel, he runs a risk: reproducing the logic of the unconscious, organizing it into a “coherent” story.
Borges said that he had two recurring nightmares: the labyrinth and the mirrors. If something stands out in the dream story, it is that they are all quite similar. We are not original in that area.