There is a way to protect against the nightly attacks, which does not include garlic BTW. The attacks are set to happen between 11 PM - 3 AM that means if you send your Sims to bed at this time it can happen, usually in my game it starts happening at around 2:15 - 2:45 for whatever reason. But that's it, if your Sims are awake during this window, the vampire just does not come inside! Or the event does not get triggered! If your sim is awake and it is already triggered, the vampire will leave without the attack!
EDIT: not reading the lore and starting to get the skill does still trigger the first night attack which usually is done by Vlad, unless you added other vampires such as the trailer vampires! The first night attack is scripted and happens with any household that was NOT introduced officially to vampires yet! After this initial tutorial so to speak Vlad won't come back, I never saw a vampire attack twice in my game. At least not from the same vampire. But I also added the other's from the trailers, so the game apparently has more to choose from.
