Official lights out? Who's official?
When I was a SM, the adults liked staying up late, sitting around the campfire chewing the fat. We would get into discussion that lasted long into the morning. We did try to keep the volume down, though. And at summer camp, there were a lot of adults from other units that did the same thing. Oh yeah, we let the boys stay up in their tents as long as they didn't get out of hand!
Don't sweat the small stuff.