Where do dreams go when you wake up?

Dreams - the simple answer is either they are stored in your memory or you forget them. But this question make us ask a great number of other questions. What is the difference between day dreaming and the dreams we have when we are asleep? Can dreams foretell the future? How long do they really last? Do we have dreams in color or only in black and white? Why do we forget some dreams and remember others? Are dreams good for us, or bad? Why do some dreams wake us up at once and others not? Some experts say that to be healthy in mind, we have to dream every night,  whether we remember them or not. There is a book called An Experiment with Time by J.W. Dunne, which tells us that the author use to note down in the morning the dreams he had in the night, and that sometimes foretold what was going to happen in the future. He suggest that when we are wide awake our sense of time is vertical, so that we are aware only of the present moment, but that when we are asleep, time becomes for us horizontal, so that we can travel into the past and to the future. Other experts say that we dream of doing the things which for various reasons, we cannot do in our waking hours. So we try to realized in our sleep wishes that cannot be realized by day.