Sleeping completely soundly with your eyes wide open
Nocturnal lagophthalmos is the highly creepy phenomenon where the eyelids fail to close entirely during rest. Due to poor muscle tone in the face, the person achieves deep, peaceful sleep while staring blankly across the room. It is entirely harmless to the sleep cycle itself, but it guarantees that anyone walking into the bedroom will be thoroughly and permanently unsettled by the dead-eyed stare.

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