Is Sleep Paralysis Demonic?

Can the ubiquitous sleep paralysis demon be explained by science? Turns out the answer is usually yes, but not ALL the time.
Something was Crawling on Me

Christian awakes to a sinister shadow figure crawling on him.
Sidetable man, don’t eat me!

If you saw a rotting corpse eating out of a brown paper bag on your nightstand, how would you react?
Astral Projection and the Darkest Darkroom

Dark room photography took a new twist for a young college student when a scary demon tried to grope her in the middle of the night as she worked.
The Dormitory Demon of Mumbai

If it’s just sleep paralysis, then why is it happening to all the dormers?