It is hard to imagine that summer is now behind us, but it’s true. As we head into winter, we’re encountering shorter daylight hours and more grey skies. As a result, we sometimes find that winter will trigger Seasonal Affective Disorder (SAD). How do we treat SAD? In severe cases, medications may be needed, and as adjunctive treatment, light therapy may be added. Effective light therapy is achieved by exposure to 10,000 lux cool-white light. Optimal exposure is for 30 to 45 minutes early in the morning upon awakening.