Five-second answer

Claim we investigated

The average person swallows eight spiders per year while sleeping.

False. The figure has no scientific source, and spider behavior makes the scenario highly unlikely. The claim that an average person swallows eight spiders each year while asleep is not based on a study, surveillance system, or documented case series. The Burke Museum's arachnology curator explains that a spider would have to enter a large breathing animal's mouth and remain there through swallowing, despite airflow and vibration that do not make a sleeper an attractive destination. UC Davis entomology outreach independently describes nighttime spider swallowing as an urban myth. The number also changes across retellings. A frequently repeated explanation attributes the myth to a 1993 article by a supposed columnist named Lisa Birgit Holst, but Snopes now states that the columnist and publication were invented for a 2001 in-joke and that the rumor's real origin remains unknown. A 1999 newspaper list shows a version already circulating before that fabricated attribution appeared.

Quote or cite this fact-check

FactHub rates the claim “The average person swallows eight spiders per year while sleeping” False (high confidence): The figure has no scientific source, and spider behavior makes the scenario highly unlikely. Reviewed October 6, 2026. https://facthub.org/n/article/people-do-not-swallow-eight-spiders/2

One-minute summary

What the evidence establishes

  • No study or monitoring program supports an average of eight swallowed spiders per person per year.
  • A sleeping person's breathing, movement, heartbeat, and possible snoring create airflow and vibration; arachnid experts describe deliberate entry into the mouth as extraordinarily unlikely.
  • The rumor appears in varying numerical forms, which is inconsistent with a measured population statistic.
  • No formal scientific or medical record establishes recurring spider swallowing during sleep, but absence of records cannot prove that no isolated accident has ever occurred.
  • The story that Lisa Birgit Holst invented the myth in a 1993 PC Professional article is itself fabricated; Snopes says it created that attribution in 2001 and that the rumor's origin remains unknown.
Important context: Fact check - whether people on average swallow eight spiders per year while sleeping. The article evaluates the numerical population claim, biological plausibility, documented evidence, and the reliability of a commonly repeated origin story. It does not claim that every imaginable one-off accidental encounter is impossible.

The evidence

The conclusion rests on the combined record. Expand each item to see its role and limitations.

Independence note: This check uses 3 methods across 5 institutions and 2 countries or international groupings.
Evidence map
Method Institution / country Year(s) What it shows Key limitation Primary links
Expert review of spider behavior, physical circumstances, and reported cases Burke Museum of Natural History and Culture, University of Washington United States 2026 The Burke Museum's spider-myths page states that the claim has no basis in fact and appears in multiple inconsistent forms. It explains that swallowing even one live spider during sleep would require a chain of highly unlikely events and reports no formal case in scientific or medical literature or credible eyewitness account of a spider trying to enter a sleeper's mouth. This is a specialist museum assessment, not a systematic database review or controlled experiment. Lack of a formal report is evidence against a recurring average but cannot exclude every unobserved accident. Burke Museum of Natural History and Culture
Academic entomology myth assessment Bohart Museum of Entomology, University of California, Davis, University of California Agriculture and Natural Resources United States 2020 UC Davis entomologist and museum director Lynn Kimsey is quoted rejecting a version of the nighttime spider-swallowing myth with the statement that it never happens. This independently supports treating the recurring claim as folklore rather than a measured dietary exposure. The short outreach statement does not present original data or quantify the probability of a rare accident, so it corroborates the myth assessment without independently measuring incidence. University of California Agriculture and Natural Resources
Source-provenance audit using the publisher's disclosure and a dated archival example Snopes, The Guardian United States, United Kingdom 1999, 2001, 2026 Snopes discloses that Lisa Birgit Holst and PC Professional do not exist, that the name is an anagram of 'This is a big troll,' and that it created the attribution in April 2001 as an in-joke. A Guardian list published in September 1999 includes an eight-spiders-in-a-lifetime version, demonstrating that the rumor predated Snopes' fabricated explanation. Snopes states that the actual origin remains unknown. The 1999 item is evidence of circulation, not the rumor's first appearance, and Snopes' disclosure documents its own fabrication rather than identifying the original source. Snopes The Guardian
1. Arachnology curator finds no factual basis or formal record

The Burke Museum's spider-myths page states that the claim has no basis in fact and appears in multiple inconsistent forms. It explains that swallowing even one live spider during sleep would require a chain of highly unlikely events and reports no formal case in scientific or medical literature or credible eyewitness account of a spider trying to enter a sleeper's mouth.

Limit: This is a specialist museum assessment, not a systematic database review or controlled experiment. Lack of a formal report is evidence against a recurring average but cannot exclude every unobserved accident.

Verify: Myth: You swallow spiders in your sleep

2. University entomology outreach independently rejects nighttime swallowing

UC Davis entomologist and museum director Lynn Kimsey is quoted rejecting a version of the nighttime spider-swallowing myth with the statement that it never happens. This independently supports treating the recurring claim as folklore rather than a measured dietary exposure.

Limit: The short outreach statement does not present original data or quantify the probability of a rare accident, so it corroborates the myth assessment without independently measuring incidence.

Verify: About Those Urban Myths in Entomology

3. The Lisa Holst origin story is fabricated, while a version circulated by 1999

Snopes discloses that Lisa Birgit Holst and PC Professional do not exist, that the name is an anagram of 'This is a big troll,' and that it created the attribution in April 2001 as an in-joke. A Guardian list published in September 1999 includes an eight-spiders-in-a-lifetime version, demonstrating that the rumor predated Snopes' fabricated explanation. Snopes states that the actual origin remains unknown.

Limit: The 1999 item is evidence of circulation, not the rumor's first appearance, and Snopes' disclosure documents its own fabrication rather than identifying the original source.

Verify: tHis is a Big troLl 50 Top Pieces of Trivia

Common questions

“Someone could accidentally get a spider in the mouth, so the statistic might still be true.”

A one-off accident would not establish an average of eight per person per year. The numerical claim would require many recurring, observed events across the population, yet no measurement or case series supports it.

“The precise number eight must have come from a scientific study.”

No underlying study has been identified, and versions of the rumor use different numbers and time spans. Precision in wording is not evidence that a measurement occurred.

“Lisa Holst created the myth in a 1993 article to show that people believe internet facts.”

That account should not be treated as history. Snopes says the named columnist and publication were invented for its own 2001 in-joke, while a dated 1999 example shows the rumor was already circulating. The real origin remains unresolved.

Conclusion

There is no credible basis for saying that people swallow eight spiders per year in their sleep. No measurement supports the average, no formal scientific or medical record establishes the recurring event, and arachnid specialists describe the required sequence as extraordinarily unlikely. The precise-sounding number should not be repeated as a statistic. The rumor's verified origin is unresolved: the Lisa Holst and 1993 PC Professional explanation is not an origin record but a fabricated attribution disclosed by Snopes. Confidence: High that the claimed average of eight per year is unsupported and false; lower for absolute claims that no isolated accidental ingestion has ever occurred.

How we checked

  1. Define the evaluated claim as a population average of eight spiders per year during sleep, not an absolute assertion about every possible accidental ingestion.
  2. Prioritize arachnology and university entomology sources for behavioral plausibility and reported evidence.
  3. Look for a traceable study, formal record, or stable measurement behind the number and preserve the limitation that absence of evidence is not proof of impossibility.
  4. Audit the popular Lisa Holst origin story against the publisher's own disclosure and a dated pre-2001 example.
  5. Separate evidence that the rumor circulated by 1999 from any unsupported claim about where or when it began.

Editorial note: Scope: this article assesses the population claim of eight swallowed spiders per person per year during sleep. Absence of documented cases cannot demonstrate that no accidental ingestion has ever happened. The biological discussion is expert explanatory evidence rather than a direct experiment in sleeping humans. The rumor's earliest origin remains unknown, and the 1999 example establishes circulation by that date, not first publication. No external specialist review has been recorded. Readers can verify the conclusion by opening the museum and university sources, checking the archived 1999 example, and reading Snopes' disclosure about its invented Lisa Holst attribution.

Expert-review status

No external specialist review has been recorded. The evidence, source trail, and limitations are provided for direct reader verification.

Funding and conflicts

Funding: No external funding was received for this fact-check.

Ownership: FactHub is responsible for the article and its editorial process.

Conflicts: No known conflicts of interest are declared.

Sources

Sources are labeled by their role so readers can evaluate the evidence independently.

  1. Primary specialist assessment of biological plausibility and documented cases Burke Museum of Natural History and Culture. Myth: You swallow spiders in your sleep Identifier: Burke Museum spider myth page

    University museum arachnology page explaining why the rumor has no factual basis and why the required sequence is extraordinarily unlikely.

  2. Independent academic entomology corroboration University of California Agriculture and Natural Resources. About Those Urban Myths in Entomology Identifier: UC ANR Bug Squad entomology myths article

    University outreach article quoting Bohart Museum director Lynn Kimsey rejecting nighttime spider swallowing as an urban myth.

  3. Publisher disclosure correcting the fabricated Lisa Holst attribution Snopes. tHis is a Big troLl Identifier: Snopes Lisa Birgit Holst disclosure

    Snopes explains that Lisa Birgit Holst and PC Professional were invented, dates its in-joke to April 2001, and states that the rumor's actual origin remains unknown.

  4. Dated evidence of pre-2001 rumor circulation The Guardian. 50 Top Pieces of Trivia Identifier: The Guardian, 29 September 1999

    A September 1999 list includes a version claiming eight spiders swallowed in a lifetime, demonstrating circulation before the fabricated 2001 origin story.

  5. Article image source Wikimedia Commons. Tegenaria domestica Bytom Identifier: Wikimedia Commons file 96184693

    Source page for Adrian Tync's photograph of Tegenaria domestica, licensed CC BY-SA 4.0.

  6. reference Burke Museum spider myth assessment

    Specialist overview of the rumor, its variants, and the lack of documented cases.

    Identifier: spider-burke-resource
  7. reference Snopes disclosure about the fabricated origin attribution

    Source-provenance correction for the Lisa Holst and 1993 PC Professional story.

    Identifier: spider-origin-resource

Update history

  1. Rating standardized under FactHub's verdict rules (was a free-text finding); the headline now states the finding. The evidence and conclusion are unchanged.
  2. Initial final article evaluating the eight-spiders-per-year claim, biological plausibility, documented evidence, and the fabricated Lisa Holst origin story.

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View ClaimReview JSON 
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