Humans have always slept, but our descendants may be doing it quite differently than current generations. Dr. Clete Kushida, former president of the World Sleep Society and a neurologist at the Stanford Center for Sleep Sciences and Medicine, tells Josh Robin that technological advancements may make fewer hours of shut-eye just as healthy; that deep sleep may one day prove easier to get; and that one day we may even be recording our dreams. Scientists are also hoping to answer the most basic, but elusive question: Why are our bodies programmed to need sleep at all? Plus, a debunked prediction on pajamas.