Hallucination
I sometimes have hallucinations at night. Also, I have had sleep paralysis as well.
He, she, they/them. I don't know which one it is. I can see a dark tall person coming slowly closer and closer every second. (sigh) They reach to my chest with their long arms, I feel their ice-cold hand on my chest. Then "puff". It disappears like smoke. In one minute it seemed real in other unreal, just smoke. Not the first time not the last. Small, thin, and tall. They are different every time, they are black like shadows, white like light, or grey like smoke.