One thing to remember is to make sure someone always knows where you are. Night riding I think is more spooky to us than it is our horses. Horses see quite well in he dark, unlike us. Make sure that you keep a flashlight, not just with you, but -on- you. If for some reason you got left in the dirt (sure it would suck, especially at night, but let's always be prepared) you won't have access to the saddle bags that are attached to Courage the Cowardly Lion's saddle horn, and you could get stuck walking in the dark. For that reason I would also suggest carrying your cell -on- you, but that should go for the day time, too. I've never been riding on trails at night, but I do often work and ride in the round pen at night. Something about just you and the horse and the crickets is exhilarating. Alot of times I go out at dusk thinking I can beat the sun and when I'm done I haven't yet realized that the only light I have left is star/moon light. Suprisingly, I can see quite well, and again, my horse can see even better.
Anyway, if you do go out, I hope you have fun and stay safe! ^^ Maybe someday (somenight) I'll join you on the lonely trails once my green broke haflinger is, well, more than green broke... ^^