More consistent sleep probably wouldn't hurt XP

Definitely not! :D

obsessions seem to be generally unhealthy and that's what that is.

I know a few people like this where a lot of their productive time is spent making themselves feel as good as they can physically, but they end up "overinvesting" and skipping other aspects of life, so they don't feel that great and then end up in a loop.

No idea about the vampire writers, but I think "villains" are often representations of ourselves and our fears - our darker side. The way we might be, if no one was watching.