To wit, a sufficiently dense concentration of heat, light, or radiation could produce an event horizon similar to that of a black hole, which definitely would count as a noticeable relativistic effect.
Not as much as necrotic tissue still attached to the patient, I suppose.
(The idea is that these maggots are extremely good at debridement, that is, at eating only the dead tissue and leaving the still healthy ones alone; other methods, like scalpels, can't be so discriminating, and force the doctors to remove healthy tissue to make sure there's no necrosis left).
I don’t know about scientific studies, but in my experience I sleep best when the mattress side of the bed is positioned towards the ceiling. Also, putting the bed in front of the door can be somewhat inconvenient, specially if the door opens inward. Other than that, everything else seems to mostly be fair game.