Can we control what we see in our dreams?

I believe that Dreams are stories created by our brain from the objects(for e.g. images) which are stored there as a result of what we see in our daily lives. Of course the link between those objects is our thinking/belief/ideology about the situation that we see in the dream.
I believe that we recognize only those things that we see and observe, but we don't recognize things which we must have seen and not observed
I would love to know your views on dreams and ask you that Can we take control of what we see in our dreams? If yes, then how? Also why do people day dream?