I've always lived in northern climates, and the last few years, an area with little light as well, maybe 6 hrs at best. I have always had the lethargy in the winter. Every year like clockwork. Even when I exercise, while it helps, I could still sleep in every day, and nap in the afternoon. I try to get outside and XC ski when I can, run etc. its frustrating to no end. I started on welbutrin this fall in an attempt to combat this, (along with light therapy, exercise, good diet, vitamin D, iron pills etc which I always have done every winter). I didn't notice too much of a difference from August till November at the initial dose. I was still somewhat lethargic, but maybe not as bad. We upped the dose and wow, I have never had this much energy before in all the years I can remember (I'm early 30's and decent physical shape, but a few pound to loose). The afternoon sleepiness at work and at home on days off is pretty much gone. i don't want to nap so much anymore. I have even tried to lay down for a nap (after a long winter hike), and while usually I can pass right out because I'm pretty wiped after a good hike, I can sleep 3 hrs solid no problem, I couldn't! I tried, but just didn't happen. So after years of struggling with SAD, I really am finding welbutrin to be a life saver. So I have had so much energy during the day, that I am finding it so easy to workout more and I'm sure that just makes things even better. Definitely the combo is doing it for me. So if you have struggled with SAD, and nothing seems to work, consider welbutrin. I sound like an advertisement. I don't like taking drugs if I can avoid it, but it really has changed this winter for me.