Meir Kryger, MD, talks about Seasonal Affective Disorder (SAD), signs, symptoms and treatments. Learn more about Dr. Meir Kryger by visiting his Elsevier Authors bio page or visit The Doctor’s Channel for more informative videos from medical experts. And check out Dr. Kryger’s popular books, Principles & Practices of Sleep Medicine, Kryger’s Sleep Medicine Review, and the Atlas of Clinical Sleep Medicine.