If on average, a person eats 8 spider in their sleep per year and assuming that no one other than one person ever ate a spider in their sleep, someone eats 64 billion spiders in their sleep per year
If they only swallow spiders that are 0.1 mg, they would consume 6400 tons of spiders every year
If they only consume spiders that are 175 g, they would swallow 11.2 billion tons of spiders every year
Edit: i know its a myth, thats why i said "if"
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For one, the myth is that people swallow 8 spiders per year not per night.
Another, its a myth. https://www.snopes.com/fact-check/swallow-spiders/
The myth goes deeper.
The story of Lisa Holst originating this myth as a spoof fact is also a myth.
Neither the supposed journalists, Lisa Holst, nor the magazine, PC Professional, exist.
The hunt is on for the earliest reference. Probably on a newsnet group.
https://www.snopes.com/lisa-birgit-holst/
Usenet could potentially have the earliest online reference, but this myth could be ancient. Spiders and humans have always coexisted.