An a semi related note, Kellerman was talking about Arreolas and said something about sleep paralysis and how it happens to him once a year.

I had no idea what it was and googled it, turns out I had sleep paralysis once. It was last summer and I was convinced there was a ghost or evil spirit next to me and I literally couldnt move, like I was paralyzed with fear.

I was freaked out by it and still remember it well.

Turns out there is a logical explanation for it. Though according to wikipedia most cultures around the world do believe it has to do with a ghost or evil spirit.