Where in Canada do you live? It reaches very cold temperatures here as well. I beleive there has been studies that correlate weather with depression. The cold, ugly weather definelty makes me depressed, thus makes you tired and you don't want to go outside the house!! Is there a gym/weight room where you live? Getting out of the house and excercising really lifts up my mood, especially if you have a friend/boyfriend to do it with! It's just getting through the first move to actually do something that is hard, I totally understand that, I am actually trying to get myself motivated to excercise as well, but it helps that my boyfriend does everyday. Once you actually go and do it you should feel more energy, unless of course you overdo it