Not feeling like Little Mary Sunshine today? Kind of down in the dumps, maybe you don't feel like letting the blue bird of paradise fly up your nose? Can't find a sunny side of the street to walk on? You are not alone.

Get the tissues handy: The saddest day of the year approaches. One researcher pegs that as Jan. 17 for a host of reasons—the presents are gone, the bills are due, the resolutions are busted, it's cold ... you get the picture.

There are reasons , real reasons to feel less that wonderful today, we'll explain