is there a way to stop vampires from breaking into my house?

Hang a garlic braid or wreath outside the door.

@dlarlQma 
Good advice from @LaurenNumberOne @kreatora 😉 

You can find the garlic garland and wreaths in the debug menu.

Also there is a room in my gallery called "Vampire Protection Kit" that has garlic wreaths and vampire pack seeds. My gallery ID is EuphorialQueen the same as here.

- EQ Avid Sims Player
I do not work for EA
All packs installed and patches are current.

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@Psychotps wrote:
@dlarlQmaIt's seriously annoying. For a long time I've been cheating, using objects enable to go into the buy mode and just pulling out a garlic wreath and putting it near my sim's bed. It always prevents it.

However, yesterday I decided to play it normally WITHOUT cheating, it took my sim a week to grow the garlic by hand so I'd have enough to make the wreath. My sim was visited EVERY SINGLE NIGHT and got bitten every night.

If I had my sim stay up, I saw three different vampires show up and then walk away in one night when they realized my sim was awake.

It's SERIOUSLY annoying.

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They most certainly are annoying. The required skill level plus having to grow the plants is time I would rather have my Sim doing something else.
You must have some pretty tasty Sims to have them be bitten every night. 😮 Though I have had frequent visiting vampires my Sims usually only get bitten once.

- EQ Avid Sims Player
I do not work for EA
All packs installed and patches are current.

@EuphorialQueen

Well, planting the garlic can be done right away but learning the wreath does take time, computer research, then purchase the 1st edition book, reading... Then you have to harvest it 2 or 3 times in order to get 10 for the crafting.  You're right, it does take a lot of time if you don't want to be constantly bitten.

I've been playing an alien lately. Not sure if aliens are more "tasty" than others... It was in the city also, game seems to act a lot buggier there.

One thing I'll say... even though it's very annoying, once I finally made the wreath and and a vampire showed up yet again... and finally failed... It was a lot sweeter. Interestingly, the vampires haven't shown up since. I played it all yesterday and today. Not a vampire since.

Still... I think I'll keep cheating and just give myself the wreath.