I remember seeing a gray man looming above my bed

He was a shadow. I was much younger. I was afraid, so I tuned him out. He was just watching. Watching. Every night. I never heard him. I just saw him. Felt him.

I was told to stay away from the shadows many times, but I have noticed they tend to be lesser entities that feed off of negative emotion, which is why they more commonly noticed during times of puberty, when people have additions (especially drug ones), when something very traumatizing happens and poor mental health.

They themselves don’t necessarily cause it, but can encourage a person to not get help they need (seen that in an ex boyfriend), but mostly they feed off of it.

Shadownomicon: Grimoire of the Shadow People