Night riding is something wicked. Its something you have to experience to understand. On a good trail at night its exhilerating. My riding friend and i misjudged when the sun would fall and spent the last 5 miles of our ride in the dark w/out a light, it was kinda fun. Around the last 3 miles we caught up to a guy with a helmet light and piggy backed him the rest of the way.
Sweat less at night too