In this enduring bestseller, Dr. Norman E. Rosenthal provides empowering information and guidance for the millions who suffer from seasonal affective disorder (SAD). Over 100,000 readers have learned science-based ways to boost their energy and overcome low moods and problems with sleep, concentration, and food cravings - even during the darkest winter days. Dr. Rosenthal helps readers map out their own seasonal patterns, get the most out of light boxes and other effective self-help options, and make informed decisions about antidepressants and psychotherapy. Updated throughout, the fourth edition features a compelling new chapter on meditation and is designed to be even more user friendly, with chapter-opening questions, engaging boxes and bulleted lists, and downloadable worksheets.