This is one of the reasons we traded our HTT for a TT. We camp for bike races and need to be able to turn in early and get a good night sleep before racing, and it was sometimes hard to do with neighbors just having regular conversations outside. The tents just offer no noise protection at all.
Running the AC or at least the vent on high helps, but only if you like to sleep to the roar of the Ac unit.
Just remember that it works in reverse also. Those pillow talks are fair game for your neighbors!