It's not a surprise when you think about it, but Americans' main leisure activity is participating in experiences that we know are not real, i.e. TV, movies, video games, books. Paul Bloom on "The Pleasures of Imagination," from the Chronicle of Higher Education:
This is a strange way for an animal to spend its days. Surely we would be better off pursuing more adaptive activities—eating and drinking and fornicating, establishing relationships, building shelter, and teaching our children. Instead, 2-year-olds pretend to be lions, graduate students stay up all night playing video games, young parents hide from their offspring to read novels, and many men spend more time viewing Internet pornography than interacting with real women. One psychologist gets the puzzle exactly right when she states on her Web site: "I am interested in when and why individuals might choose to watch the television show Friends rather than spending time with actual friends."
Why is this exactly? Mainly, Bloom says, because imagining experiences is a lot less work. But the fictional life is more interesting too:
... fictional people tend to be wittier and more clever than friends and family, and their adventures are usually much more interesting. I have contact with the lives of people around me, but this is a small slice of humanity, and perhaps not the most interesting slice. My real world doesn't include an emotionally wounded cop tracking down a serial killer, a hooker with a heart of gold, or a wisecracking vampire. As best I know, none of my friends has killed his father and married his mother. But I can meet all of those people in imaginary worlds.