As I think, every person in the world have dreams while sleeping. But some people can remember what they have seen, and the athers - doesn't.
Dreams can be different. It can be like adventure story, or a thriller... Sometimes your dream looks like a real life. And you feel very strange when you wake up in the morning and go to the fridge because you 100% sure, that there's an ice-cream inside. Because you remember that you put it there. And it's not easy to believe, that the ice-cream was in the dream only.