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 - eviltoast

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”