I get sleep paralysis with the 'old hag' syndrome (this goes by many names)
(it is where a creature sits on your chest while in sleep paralysis, sometimes see them or hear them, sometimes we just feel them)

for those who get the old hag:

what are some of the characters you've seen?
what do they look like?
what do they say?

one that comes to mind for me:

a large thing that just stares, it's hairless body folding over itself, just staring, there is no real distinction between head, body, legs, feet, all just mixed together, i recall eyes but nothing else specific