“We swallow eight spiders a year in our sleep”

The unsettling notion that humans unknowingly swallow multiple spiders each year while sleeping is a widely circulated claim, but it has no basis in reality. This specific statistic, suggesting an average of eight spiders are consumed annually, did not originate from scientific research or observation. Instead, it was intentionally fabricated in a 1993 column by Lisa Holst for PC Professional magazine. Her purpose was to illustrate how readily people accept and spread even the most outlandish "facts" when presented as genuine information on the nascent internet.

From a scientific standpoint, the idea is highly improbable. Spiders are sensitive creatures that typically avoid large, warm-blooded mammals like humans. A sleeping person produces vibrations through breathing and heartbeats, which would deter a spider from approaching, let alone crawling into an open mouth. Furthermore, a human mouth is not an inviting environment for a spider, being warm, moist, and filled with potential disturbances. Spiders are far more likely to seek quiet, undisturbed spaces for shelter (Review).

Despite its fictional origins and logical inconsistencies, this myth persists largely because it taps into common human anxieties and fascinations. Many people have a natural aversion or fear of spiders, and the idea of unknowingly interacting with them in such an intimate way is particularly unsettling. The sensational and slightly gruesome nature of the claim also makes it memorable and easily shareable, contributing to its longevity as a piece of popular misinformation.