A few years back, my wife invited one of her cousins to come visit us.
That somehow turned into the cousin bringing her daughter and her daughter's boyfriend. I didn't particularly mind, but it made for some odd sleeping arrangements. The cousin and daughter took the master bedroom, my wife was in a separate bedroom, and the boyfriend occupied a 3rd bedroom, next to the wife's bedroom. I was relegated to sleeping either on the couch in the living room, or another couch in the basement.
One evening, as conversation was flowing, my wife felt the need to announce that she sleeps naked.
What makes it even more interesting is that she doesn't close her door. And, of course, during sleep, the sheets/covers can become askew, and there have been occasions where body parts are on display. And there's always the possibility of a not-so accidental ********, as well.
I would ask her every day if he was peeping her during the night. She said she though he was for sure one night, but wasn't sure about any of the others. And she was making sure that he had something to look at most nights, just in case...