Sounds like a way around this is to rig up some kind of high/low pitch directional sound system that prevents them from sleeping and goes through ear protectors. All you have to do is put it in the wall and set it to make its noise after a random duration between 5-100 mins has passed. If you added some accelerometer detection, it could even stop when it detects someone making any considerable noise near it. If they try to rip it out you can have them arrested for vandalism of private property.
What are they going to do? Complain about it?