Daydreaming is an art form for yours truly. As artist and designer, I find myself doing this constantly and, for me, and for people like Einstein, it's a good thing. For Albert, he daydreamed about riding on a beam of light while riding the tram to work as a patent clerk. For Arthur Koestler, daydreaming, humor and the combination of two or more dissimular ideas to come up with a new idea are the prime drivers for creativity and imagination, concepts I find comforting as I look out the window, continuing to dream about whatever comes to mind. :)
"To encourage this creative process, Dr. Schooler says, it may help if you go jogging, take a walk, do some knitting or just sit around doodling, because relatively undemanding tasks seem to free your mind to wander productively. But you also want to be able to catch yourself at the Eureka moment.