I ride in the dark a lot during hunting season. We get up early, ride to where ever we want to hunt in the dark and tie the horses up and hunt all day, Return to camp after the sun has gone down. The best hunting hours are at sun up and sun down. We've also killed game and it takes an hour or so to cut it up and pack it on the horses. So we often make hour rides in the dark.
I am amazed at what my horse can see and how well they can find the trail in the dark. I've run into big black objects in the dark and not always known what they were. Pull my flashlight out and see a couple of Moo Cows on the trail or sometimes a big Moose or Buffalo. The cows I just herd off, no big worry, The moose and buffalo, I yell at and try to scare off. But I don't want to push the horse too close to wild animals in the dark.