Seasonal affective disorder (SAD), or winter depression, is a mood disorder related to the change in the seasons and lack of exposure to daylight. It affects 1 in 100 adults in western countries. SAD is a rare example of a psychiatric disorder with a clear, identifiable biological cause. The new edition of this award winning book brings together distinguished scientists and opinion leaders to discuss the current and anticipated developments in the study and care of Seasonal Affective Disorder. Highlighting the clinical diagnosis and management of Seasonal Affective Disorder (SAD),this book provides a valuable resource for all whom are involved in the health care for patients with SAD. This book deals with the range of therapeutic measures that are available for the treatment of SAD. In addition, this book elucidates potential areas of research that have emerged such as thestudy of the circadian pacemaker and the night-time sleep structure and their interaction that influences mood.