January 19, Blue Monday 2026, the most depressing day of the year. Why is it called "the saddest day of the year"

'Blue Monday', also known as 'The Sad Monday', is the day in the third week of January, considered the most depressing day of the year. This name was popularized in 2005 by Sky Travel and is based on a formula that takes into account factors such as the weather, accumulated debts, days since Christmas, and low motivation. January is a difficult month for many, with negative effects on well-being caused by excessive consumption in December and lack of sunlight. However, for optimists, it is an opportunity to set new goals. Experts suggest strategies to combat sadness, such as spending time outdoors, exercising, planning enjoyable activities, and celebrating small achievements.