I've done it in PA at night as well. Like everone else said, pick a stream you know. Also, try not to wade. Wading at night, even on a stream you know, is taking a risk you just don't want to take. The guys who said streams become different places at night are right on. It does freak you out at first. Be safe, that's the number one priority.
Rig up before you get out to the stream. You don't want to be messing with tippet and flies when you get out there. Someone said unweighted sculpins. I'll second that. Unweighted sculpins, mouse patterns, anything that pushes and displaces water. Pound the banks!
Oh, and keep your head lamp OFF THE WATER!
And watch out for bears!