why do we dream?

Dreams often seem to be very strange indeed. But why do we have them? Freud said that dreams show us our true subconscious desires. Our dreams show us what we really want in life. Scientists have a different opinion. They believe that dreams are the products of our brain processing information that has been recieved throughout the day. It puts important stuff in your memory and forgets the rest. This could explain why we often see friends and family in our dreams, as well as falling Tetris blocks.