Blue Monday: Why it's a 'load of rubbish' Christmas is over, it's cold and dark outside and that summer holiday seems like a world away.
Blue Monday - also known as the most depressing day of the year - has been trending on Twitter all day.
Coined by psychologist Cliff Arnall in 2004, it falls on the third Monday in January every year.
He came up with it after a holiday company asked him for a "scientific formula" for the January blues.
Unsurprisingly, there was nothing scientific about it. BBC News