You’ve heard of the “winter blues,” but some people experience the next level of moodiness when the seasonal darkness rolls around.

Dr. Norman Rosenthal is a Psychiatrist and Scientist who first described Seasonal Affective Disorder, a type of depression that occurs every autumn and winter when the days get short and dark. He joins Kennedy to ​elaborate on his research and explains how he developed light therapy as a treatment.

Follow Kennedy on Twitter: @KennedyNation

Kennedy Now Available on YouTube: