Less harassment at night. Why?
Yes I have noticed this too, and I believe it's due to the same reason I receive less harassment in poor weather. Drivers figure I must be on the bike for essential transportation... not playing in "their" street just for kicks and recreation, like the summer racer groups do. Plus, in the winter there are simply a lot less bikes, so drivers likely find it much more tolerable.
Like Joey, I too "feel much safer and better seen after dark - from motorists" with my lights and reflectors. But unlike him I have little fear of human criminals on my night rides. It's wildlife that concerns me. In the darkness it would be easy for an animal to pop out into my path with no notice, even though I have a powerful head light. It does cause me to limit my speed at some points.