"Dreams don't happen to us, we happen to them," says Edinburgh-based dream psychologist Ian Wallace, author of "The Top 100 Dreams". In other words, we're the director, star and producer of all the movies that play inside our heads after we fall asleep (in fact, we create about five 15- to 40-minute dreams per night). But it's not just for our own entertainment. "In dreams, new information is combined with old information of the person's life in a creative way so that new solutions might emerge," says researcher Michael Schredl, Ph.D., from the Central Institute of Mental Health sleep laboratory in Germany. If you want to make sense of your own dreams, first put paper and pencil on your nightstand, and write down what you dreamed about when you first wake up, Schredl advises. Then compare notes with this list of 10 common dreams, what they mean and what to do about them. It's about to get straight-up "Inception" in here.