I know surprised me, was my sims were sleeping, time went from fast to normal and no one was awake. I looked towards the front door and a vampire sim was doing the stalking thing. My sim woke up and just stood there. I moused over the queue and it said, "Be drank from". I couldn't ex it out so I just watched as the vampire snuck into the bedroom, had his "snack" and left. Of course, my, sim fell over and slept on the floor for a few minutes, woke up and went back to bed. Funniest thing I have seen. Only happened the one time, but I love those vampires.