I get the SAD very badly in the winter too. Some girls I know do a wee bit of the tanning bad. I'm super fair, so I don't. I saw a show once on a special type of light bulb panel a lady had by her treadmill that helped. I purposely keep all the window shades pulled way up to let as much light as possible.

As posted, I'll add another about over training. I never thought I would see the value of "taking a day off". But, wow... it was like someone kicked open a door on my fatigue level. If you want to keep the gym as your normal routine, is there something that is a recovery activity, or just relax? Does it have a pool or hot tub? Stretching class? A place to grab a healthy drink and just socialize?

Also, switching up part of the gym time to a new or different winter activity might help. My theory I'm testing is that it makes winter something to look forward to. I bought xc skis last year. And I have snow shoes on order. The children and I also bought rink skates recently as well.