A new study finds that decorating your home for Christmas can make you a happier person. Decorating for Christmas can trigger pleasant childhood memories and makes people feel more social. A study leader says "when you're putting up decorations, you're thinking of happier times, times with family and friends and family traditions you engaged in. Revisiting those happy memories stirs up happy feelings." A dose of holiday nostalgia also encourages people to give and do good, which is a mood enhancer. Altruism increases during the month of December and as people start to give more and donate more, it makes them happy. It makes people feel good so they want to start celebrating as early as possible. A recent study published in the Journal of Environmental Psychology found that decorating early can also help people interact more with their neighbors. So break out the garland and tinsel and miseltoe and holly. I'm all for whatever we can do to make things more civil these days.