With hallucinations in my case. Nothing as fanciful as an alien abduction, but I thought someone was trying to break into my dorm room. It was as real as anything else I ever experienced, and I almost called campus security once I cpould move. Until I realized that while I was paralyzed, I had seen a peep hole in my door, which had none. Then I realized I must have been hallucinating, and as I had been paralyzed and just on the edge of sleep, it fit perfectly with sleep paralysis. But it felt fully real, unlike dreams which don't.
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