I think I might have this. I have noticed it the past 2 winters. Besides sitting outside or a trip to WDW there's probably not a lot you can do. Anyone else feel like this? (And I don't think it's because of the snowfall amounts.)
If you're talking about cabin fever or the winter blues, yes I get it. It helps alot to get as much sunshine as possible. If sunshine is not available on dreary winter days, try a light box.