Sometimes we're afraid to admit that we're sad, that we're anxious, that we can't do it all. Sometimes it's hard to admit that we just want to go home and crawl into bed, put a Taylor Swift record on, and shut our eyes.
Sadness is predicted to peak on the third Monday of each new year. This is usually a result of post-holiday blues/failed new year's resolutions/bad weather and the like. Some even refer to it as Blue Monday.