Is there a way to defense from vampire attack?

@BlueR0se Vladi was standing for a few hours when he visited my house at first while my sims were in sleep. He was still standing in front of front door after my sims got up at 5 am. So I've never imagined my sim would be his target for blood hunt after inviting him in. The reason he was waiting for a couple of hours is I guess he was not able to get in without my sim's permission.