Jordan Rich filled in on NightSide:

It is suggested that the third Monday in January is the most depressing day of the year and was coined “Blue Monday” in 2004 by psychologist Cliff Arnall. The bills from the December holiday shopping sprees are starting to file in, and the abundance of overcast days isn’t helping matters. Jordan discussed seasonal affective disorder and depression with Jerrold F. Rosenbaum, M.D., Psychiatrist-in-Chief Emeritus and Director of the Center for the Neuroscience of Psychedelics at Massachusetts General Hospital, and Stanley Cobb Professor of Psychiatry at Harvard Medical School.