Do We Really Swallow Spiders In Our Sleep? - Britannica

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The belief that we swallow an average of eight spiders in our sleep every year has become so ingrained in popular culture that many people now accept it as fact. The reality, however, is quite different: we swallow no spiders at all.

There are several reasons why spiders don’t bother us in our sleep. Foremost, we’re extremely large compared with spiders, so they tend to view us merely as part of their landscape. Equally important, a wandering spider would find a sleeping human absolutely terrifying because, as we slumber, we tend to make a lot of noise via our heartbeat and breathing. These sounds create vibrations to which spiders are extremely sensitive. As a result, they likely would do all they could to avoid us.

Do we really swallow spiders in our sleep?
Do we really swallow spiders in our sleep? This myth is based on a web of lies.(more)See all videos for this article

Experts acknowledge that it’s possible that a spider could find its way into your mouth while you’re sleeping, but the chances are so slim as to be negligible. If a spider were to climb onto your face while you slept, the sensation of eight tiny legs on your skin could wake you up very quickly.

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Only a small number of spider species share our homes with us, and the majority of them prefer seclusion. They live in webs in quiet corners or inhabit areas where humans spend little time, such as basements and attics. Unless a spider in your home poses an inconvenience or you suffer from severe arachnophobia, entomologists encourage you to leave it alone. Spiders can be quite beneficial because they eat a lot of smaller pests that can make our lives miserable.

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