I've had sleep paralysis a number of times, but once was exactly the same as STM's experience, face and everything. Also a very loud noise that didn't come in through my ears. I had climbed to the top floor of the Maths building at uni for a quick sneaky snooze, and fell straight into that state without first sleeping.
It was rather alrming for the moment before I realised what it was, at which point I retreated entirely into the most rational parts of my mind and waited it out under protest. I nearly missed my lecture.
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