Boost light. Getting enough light can make a huge difference in how we feel in winter. Do what you can to boost light by pulling open window coverings during the day, adding lamps and candles, and lighting a fire in the fireplace or wood stove if you have one. Or consider decorating with white for a light, bright look — in the Scandinavian countries, white interiors are common, thanks to their ability to amplify light and cheer up homes during those long, cold northern winters.
Clear home and wardrobe clutter. Post holidays is a good time for de-cluttering, since there’s a good chance you accumulated some new things over the previous few weeks. Grab a cardboard box and fill it with clothes, books and other items you no longer love or use. When it’s full, take it to a charitable donation center.