The realest sibling relationship I've seen.
I used to sleepwalk somewhat rarely as a kid. One night, my older sister had a friend sleeping over so she was hanging out in the living room with the pull out couch and I was sleeping in our room. Mom, dad, sister, and her friend were all still up and out there, probably watching TV. I come walking out completely normally as far as they could tell, nothing amiss... and when I make it over there immediately
attempt to strangle my sister with my bare hands. Everyone is losing their shit. Asking what the hell I'm doing, yelling at me to stop. Abruptly, I stop and just stroll on back to bed. Next day, I am apprised of what took place and have no idea what anyone's talking about.
Moral of the story, your siblings will drive your subconscious to murder and god help them because it will seem completely reasonable to the parts of your brain you don't usually have much familiarity with.
Also, people who witness attempted murder sleepwalks during a sleepover tend to not sleepover again for some reason.