Allow me to join with the previous posters. I usually ride all year, and in the Winter, that means after sundown. Let me reiterate, slow down a bit, and having 2 lights is very helpful. Using a rear blinkie is also good, even if you aren't on the roads much. I also like to wear bright colors (makes it easier to find the body ).
All around, it's a blast. i hope to try it during the Summer sometime, but the bugs and the late nights (I'm old) are a bit of a deterrent. Still on the list, though.