The seasonal changes and the time change affect me too.......I find myself getting tired long before bedtime because it's dark and that's when my brain thinks I should be asleep. Dark, damp, cold, gloomy days don't do much for my mood either, although this is the first year I've been on medications and I'm doing much better than I expected. My dawn simulator is a godsend---waking up bathed in light, even artificial light, has made all the difference.