Why do vampires do this?

"LoveMcQueen5683;d-967423" wrote:
I occasionally see a vampire Sim sneak up to my door in the middle of the night but then they like just turn around and go away.

Are vampire townies allowed to just break in the house and bite your sims? Because that's what it feels like they're trying to do but I have never seen them make it past the door. And my doors aren't locked so...

Nothing is stopping them but themselves.

I'm sorry but.......duh. :D

Yes they do that autonomously. Apparently it's less offensive and traumatic than a burglar stealing your sim's valuable possessions....lol.

If your sims are awake at night the vampire won't initiate the scripted "attack" they need to be sleeping. That's why they just stand around.