Claim: Do we swallow 8 spiders a year in our sleep?

First requested: April 14, 2026 at 7:46 AM
42%

IsItCap Score

Truth Potential Meter

Low Credibility

AI consensusWeak

Grader consensus is weak.
Range 50%–100% (spread Δ50).
The graders diverge. Treat the combined score as uncertain and read the sources carefully.
Read analysis summary

OpenAI Grade

0%
20%
40%
60%
80%
95%

Perplexity Grade

0%
20%
40%
60%
80%
100%

Google Gemini Grade

0%
20%
40%
60%
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50%

Analysis Summary

The claim that we swallow eight spiders a year in our sleep is false. Mainstream sources, including the Burke Museum and Britannica, confirm that this is a myth with no scientific basis. They highlight that spiders actively avoid humans and that the conditions required for such an event are highly improbable. Alternative sources do not provide credible evidence to support the claim, reinforcing its status as an urban legend. Overall, the consensus among experts is that this claim is unfounded and misleading. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (100%), while Gemini is lowest (50%). OpenAI expresses higher confidence than Gemini on this claim. There are no credible opposing sources that support the claim of swallowing spiders in sleep. The evidence overwhelmingly indicates that spiders avoid human interaction, and the claim is rooted in a fictional example rather than factual occurrences. The absence of any scientific or anecdotal evidence further solidifies the conclusion that this claim is a myth. Therefore, the lack of credible dissenting opinions does not affect the verdict, as the claim remains unsupported by any reliable evidence.

Source quality

Truth (from sources)1.00 / 10
Source reliability9.00 / 10
Source independence8.00 / 10

Claim checks

Fits established facts10.00 / 10
Logical consistency10.00 / 10
Expert consensus10.00 / 10

Source Analysis

Common arguments
Supporting the claim
  • Spiders could wander into open mouths in rare cases during sleep.
  • Myth persists due to anecdotal stories people share.
  • Unlikely doesn't mean impossible for every person.
Against the claim
  • No evidence, specimens, or records in science or medicine.[p1]
  • Spiders avoid humans and view mouths as repelling.[p2][p3]
  • Originated as fictional 1993 example of misinformation.[p2]

Mainstream Sources

Publication

burkemuseum.org

Title

Myth: You swallow spiders in your sleep

Summary

The article debunks the urban legend that people swallow an average of four or eight spiders per year while sleeping, stating there is no evidence, no specimens, and no eyewitness accounts.

Source details

Type: Major Media
Secondary Reporting

Publication

britannica.com

Title

Do We Really Swallow Spiders In Our Sleep?

Summary

Britannica explains that the claim of swallowing eight spiders yearly is a myth originating from a 1993 article meant to illustrate misinformation spread online; spiders avoid humans and the event is negligible.

Source details

Type: Major Media
Secondary Reporting

Publication

unmc.edu

Title

Is it true that you sometimes swallow spiders in your sleep?

Summary

The University of Nebraska Medical Center debunks the claim, noting spiders avoid humans, mouths are unappealing, and odds are extremely low like winning the lottery.

Source details

Type: Primary
Published: 2023-10-31
Secondary Reporting

Alternative Sources

No alternative sources were found for this analysis.

Analysis Breakdown

True/False Spectrum (1.0)Source Credibility (9.0)Bias Assessment (8.0)Contextual Integrity (10.0)Content Coherence (10.0)Expert Consensus (10.0)80%

How to read the breakdown

Weakest areas
Truth1.0/10Independence8.0/10
  • Truth: how well sources support the core claim.
  • Source reliability: whether the sources have a strong track record.
  • Independence: whether coverage looks one-sided or recycled.
  • Context: missing details (timeframe, definitions, scope) that change meaning.
  • Tip: if graders disagree, rely more on the summary + sources than the single number.

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Methodology

Fact check: Do we swallow 8 spiders a year in our sleep?