Hygge is the Danish concept of relaxation and coziness. You've probably experienced hygge without knowing it. When you curl up in your sweats, light a candle, put on water for tea, grab a good book, you've got the perfect recipe for a hyggelig evening. But when hygge reached the U.S., it became more of a commodity than a state of being. Some Danes take issue with the commercialization of their tradition. But experts say elements of hygge could be beneficial, regardless of how they're packaged.