I get sleep paralysis hallucinations, once every 1 - 3 months usually. Most of the time there's a figure standing over me as I enter that state, and I get the greatest sense of terror when I see it. I think the fear is amplified by the sleep paralysis, but I think I'd be conditioned to think I was having a hallucination, even if the figure was real, therefore becoming helpless. So I'd probably die if that's what the stranger had in store for me.