I'm not sure but for now I'll say no situations where someone would be attacked/killed while they're asleep. (Like, in the sense that 'they settled down somewhere they expected to be safe for the night,' not as a blanket general 'no knocking a person out/putting them into a trance/etc.' Those're fine. Supernatural 'attacked by bad dreams' are probably fine too. If in doubt, I'm open to being pmed and asked!)