"A \'landmark book.\'"-- The New York Times *When the dark days of Winter approach, do you feel sluggish and slow? Is it a struggle to get out of bed each morning? *Do you have difficulty focusing at work or in relationships, feel down in the dumps, or, worse still, get really depressed? *Does it get harder than ever to stick to a healthy diet and control your weight? If you answered yes to one or more of these questions, you may be one of the millions of people who suffer f. "A \'landmark book.\'"-- The New York Times *When the dark days of Winter approach, do you feel sluggish and slow? Is it a struggle to get out of bed each morning? *Do you have difficulty focusing at work or in relationships, feel down in the dumps, or, worse still, get really depressed? *Does it get harder than ever to stick to a healthy diet and control your weight? If you answered yes to one or more of these questions, you may be one of the millions of people who suffer f
