Well... admittedly my part of the world is balmier than yours in winter, but I'm generally in t-shirts down to about 40F, and only resort to a jacket when the thermometer gets a couple notches below freezing. I certainly remember New England winters feeling just about right, but not long enough. (And too bright!)

Don't get me wrong, it's not a nocturnal/sleep pattern thing for me; or goth symptomology for that matter. My eyes are just crap and can't handle direct sunlight any more. Leaves me squinting, migraine-prone, cranky, and longing for some cloud cover so I can see where I'm going :) That the quality of overcast light is just so damn purty is all gravy.