Even when I get an unexpected knock on the door my protective instincts go overboard and I get edgy. However I enjoy friends dropping by because thats how I grew up. I tend to respect others privacy more than mine. Simply because I am not super private.
Even if i know to whom i have given keys and it's like 5 person, still, every single time i hear that key turning in lock sound i get creeps. The adrenaline spike from that is definitely the most effective way to woke up.