is that the fully awake mind may be restructuring memories of unstructured dreams to fit something it sees or has seen.
So in this situation, someone may have something on thier mind when they go to sleep; say they're looking for a new car. This person has a dream that they're driving a car down a familiar road; but as dreams go, the car they're driving is constantly in flux. The next day they go car shopping, and they come across a car that's similar to one they saw in the dream. In their mind, they latch on to the image they saw and adjust it to fit reality. Their mind in trying to structure the chaos of the dream make the dream seem to come true.