What kind of camera is that? I have a speed graphic and I love it, but I want something with more motions.
5x4 are seriously impossible to shoot at night you can see the image for shit.
Use a bright laser pointer. Shine it on something, focus till the dot is sharp. You can even map the image out on the ground glass to compose and use movements. Very useful. I do it all the time even when it's not totally dark, because it's way easier to say, focus on the front surface of something smooth, when you shine the laser on it. Otherwise, if there is no texture you have to like squint and shit. Anything you want sharp, shine the laser on it and focus till the spot is small. It's like having selective AF points, uh, kind of. I've even done swing to get different elements in focus. There's a keychain laser pointer permanently magnet'd in my speed graphic.