'One time I was so sad I wished I would go to sleep and not wake up.' Seven-year-old Dana is just one example, in this wise and enlightening book, of a child with a disease that did not officially exist until 1980. Today, the National Institute of Mental Health estimates that 2.5% of all youngsters under eighteen have crossed the line between normal sadness and clinical depression'at earlier and earlier ages. Moreover, research shows that such childhood...