Well, I haven't really talked about this to anyone (except my sister, of course).. But this was kinda a weird experience to me.
I was around 9-10 years old, I can't exactly remember, and I had just decided I actually wanted to sleep instead of staying up as I usually would. I turned off my laptop and put it next to me (yes on my bed, I was dumb). After moving around a bit I finally got into a comfortable position and heard "Heather" behind me, it sounded like a grown man, so I turned around. There was a black shadowy figure, it appeared to be tall and looking at my sister (we had a bunk bed). I was terrified, not sure what to do. I tried to sleep, without moving much because, you know, scared. I somehow managed to fall asleep and wake up at 8 AM. So there was light.
This part's freaky.
I got up, ate cereal, brushed my teeth, when I looked over. I saw it
again and I knew I wasn't seeing things because it was day.
Nothing else has happened, except for a few experiences with my sister where she thought she saw Slenderman (xD probably a white ghost. She loves Slendy.)
Now for some life details. My dad's dad had raised my dad in the same house I'm growing up in. Before I was born, he died. In this house. What I saw was more than likely him. Ever since I learned about this everything I saw before this experience had turned into moments I can smile about, because I was probably seeing my dead grandfather.