Scariest thing i didn't know i seriously have done.

A few minutes ago before I came back in my room, my brother and I were talking, he brought up a moment I never remember I did but I seriously did.
(While im typing this my head is turning both sides and behind because im scared)

Back in the day, maybe somewhere in the age of 8 so possibly 2018-2019 (I am 13.) , it was midnight, me and my siblings share a room while my parents share one together. I have two siblings, one 8-year-older brother and one sister thats one year younger than me..

My brother was staying up all night, me and my sister were sleeping in one mattress while my brother has one himself.
I woke up, and I stand up, came up and tapped him. He looked at me and asked "What's wrong?", I raised my arms pointing the door, saying "They want to play!". And my brother was confused, he started questioning and went up to check the door and outside the room, it was literally all dark. He told me to go back to bed and so I did

But 10-15 minutes after that, my brother was still up, seriously scared because of what i did after.
But then now, my sister woke up, coming up to my brother. When my brother saw my sister, he immediately tried to do the fake sleep. My sister kept tapping on him too, my brother finally responded, and my sister does the EXACT same thing but different words. My sister pointed to the door, and said "I want to play with them!". 
My brother was literally and silently panicking dude, he checked again but it was nothing.

It was all dark and the lights were off so that made him probably hide in his blanket.

And then we went back to sleep. Like nothing happened

Okay I gotta be honest, of course you wouldn't believe in this but I asked myself now "How does my brother, who is 21 years old now, remember this completely?" ...
But that is the point, I also can't believe because I can't remember but I also don't believe that my brother was making this one up.

This was at our last house we rented in, there had been a lot of crazy stuff inside. We moved houses last year in the first day of September.