I've done a DH trail in the almost dark a few times when we've stayed out too late. It can be a little freaky if you don't know the trail well because subtle drops on the trail can really throw you off. Not a good feeling when both tires are unexpectedly no longer touching the dirt
My Gambler is looking lonely and depressed lately, it's funny how in the middle of winter I mis riding my DH rig and the middle of summer I miss riding powder. A few more weeks and the lower elevated trails should be good to go.
Man, the Internet sounds like a tuff place to ride.