Insomnia is a chronic disorder that affects tens of millions of people with devastating impact, and yet, very little is known about it. In her crusade to create a comprehensive analysis of the disorder, Gayle Greene traveled the world and talked to neurologists, sleep researchers, psycho-therapists, and insomniacs of all sorts. Larry talks with Gayle Greene about her new book, "Insomniac" that delves deep into the truth about insomnia and provides advice for those afflicted with the disorder.