It seems like a somewhat morbid curiousity, but I am curious how it would all work out.
Elves are supposed to be somewhat elevated from humanity in the dream world, though I imagine we're nothing close to angels. I'm wondering if vampires would end up on the list like orcs or fel things, or if a bite from one would be considered more like being bit by something normally.
It's all just conjecture unless I become a real elf and you start actually craving blood though, I imagine.