The widely believed claim that a person swallows eight spiders per year in their sleep is a myth with no scientific basis. Experts and research indicate that it is highly unlikely for humans to swallow spiders during sleep due to several reasons: humans usually sleep with their mouths closed, the vibrations from breathing, heartbeat, and snoring would deter spiders, spiders generally avoid humans, and even if a spider crawled on a sleeping person, the sensation would likely wake them up. Cases of swallowing spiders are so rare that swallowing even one spider in a lifetime would be noteworthy, making the claim of eight per year essentially false.