You don’t swallow 8 spiders a year in your sleep. It’s so...

You don’t swallow 8 spiders a year  in your sleep. It’s so unlikely for a  spider to crawl into your mouth at  night that there’s no formal medical  or scientific record of it ever actually  happening. Spiders get most of the  information about their surroundings  through vibrations - so your snoring, breathing, and heartbeat usually  scares them away. 

(Source, Source 2, Source 3)

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