It's called the 'hygge' (pronounced hooga) and it basically means 'to have cosy time together'.
Danish families have hygge time not just every now and then, or on holidays, but as a regular activity. It's ingrained into their family culture. Think 'we-time' not 'me-time'. Think cosying up together with candles or fairy lights twinkling, supping hot chocolate and lying on beanbags chatting about your day. Think sitting out in the garden with rugs over your knees, watching the stars.
Hygge is about feeling the cosiness, and it's not hard to see how, if this is part of your everyday family life, it can make you happier.
Hygge is not about big gestures or extravagent plans: it's about creating time together and enjoying the little things in life. The things that make you feel all warm and 'hyggelig'.
There are small things you can do to make moments more hyggelig.
Lighting candles or using fairy lights is just one way to instantly change the mood, even if it's just while you're sharing a family meal.
Use snuggly rugs, cosy socks, and slouchy beanbags to make the place you're sitting in more cosy, too. Oh - and it goes without saying - ban any technology from hygge time.
But hygge is not just about cosy blankets and candles. It's more than that. It's about being together and living in the moment of being together.
In Denmark, children are brought up to know the rules of hygge: to work as a team, to keep hygge time drama-free, to cherish it.
There's even a UK college that is now teaching students the Danish way of hygge, which makes homes nicer and people happier. Susanne Nilsson, lecturer at Morley College London, said:
Hygge could be families and friends getting together for a meal, with the lighting dimmed, or it could be time spent on your own reading a good book. It works best when there's not too large an empty space around the person or people.
In a way, it's a very simple concept: making and taking time to enjoy the simple pleasures in life, cosied up with our loved ones.
But in our busy lives here in Britain, it's something we often neglect. It's certainly not ingrained as part of our way of life. If anything, our cuture is to work long hours, cram the days and weeks with more and more things to do and think about, making very little time to stop and enjoy some 'hygge'.
Author of the book 'A Year of Living Danishly: Uncovering the Secrets of the World's Happiest Country', Helen Russell, said:
Hygge seems to me to be about being kind to yourself - indulging, having a nice time, not punishing or denying yourself anything.
Hygge isn't just a middle-class thing. Absolutely everyone's at it from my dustbin man to the mayor. Hygge is so crucial to living Danishly that the other day on the motorway, I saw a camper van driving along with lit candles in the windows. This is probably illegal but Vikings don't tend to be too hung up on health and safety.