Claim: People swallow an average of 8 spiders in their sleep every year

First requested: May 20, 2026 at 7:16 AM
12%

IsItCap Score

Truth Potential Meter

Not Credible

AI consensusWeak

Grader consensus is weak.
Range 2%–50% (spread Δ48).
The graders diverge. Treat the combined score as uncertain and read the sources carefully.
Read analysis summary

OpenAI Grade

0%
20%
40%
60%
80%
10%

Perplexity Grade

0%
20%
40%
60%
80%
2%

Google Gemini Grade

0%
20%
40%
60%
80%
50%
Shareable summary
Verdict: Questionable
  • UNMC says the chain of events is highly unlikely.
  • Britannica calls the eight-spiders figure a myth.
/r/fact-check-people-swallow-spiders-sleep

Analysis Summary

The claim that people swallow an average of 8 spiders in their sleep every year is false. Mainstream sources like UNMC, Britannica, and Ripley's all debunk this myth, citing the implausibility of such events occurring. They explain that spiders tend to avoid humans and are unlikely to end up in a sleeping person's mouth due to their behavior. While some may believe in this urban legend, it lacks credible evidence and is characterized as a false belief by experts in the field. The models diverge sharply — treat this as higher-uncertainty. Gemini comes in highest (50%), while Perplexity is lowest (2%). OpenAI expresses higher confidence than Gemini on this claim. There is a singular academic source that discusses the belief in swallowing spiders in sleep, noting how such falsehoods can be accepted by the public. However, this source does not provide evidence supporting the claim itself, merely analyzing why people might believe it. This does not alter the overall verdict, as the overwhelming consensus from credible sources strongly refutes the claim.
Jump to source analysis

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
Related fact checks

Source Analysis

Common arguments
Supporting the claim
  • A spider could theoretically enter a mouth during sleep.
  • The claim is widely repeated online, which makes it memorable.
  • Some people may confuse anecdote with a real statistic.
Against the claim
  • UNMC says the chain of events is highly unlikely.
  • Britannica calls the eight-spiders figure a myth.
  • Ripley's says there is no concrete evidence it happens.

Mainstream Sources

Publication

unmc.edu

Title

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

Summary

UNMC explains that the claim is highly unlikely and describes several biological and behavioral reasons spiders avoid humans and are unlikely to end up in a sleeping person's mouth.

Source details

Published: 2023-10-31

—

URL

Visit Source

Publication

britannica.com

Title

Do We Really Swallow Spiders In Our Sleep?

Summary

Britannica states that the popular belief about swallowing eight spiders a year is false and that the real chance of swallowing spiders in sleep is negligible.

Source details

—

URL

Visit Source

Publication

ripleys.com

Title

People Don't Swallow Eight Spiders a Year While Sleeping

Summary

Ripley's debunks the urban legend and says there is no concrete evidence that people swallow spiders in their sleep.

Source details

—

URL

Visit Source

Alternative Sources

Publication

scholars.duke.edu

Title

Believing that Humans Swallow Spiders in Their Sleep

Summary

This academic chapter discusses the false belief itself and uses the 'eight spiders in their sleep each year' statement as an example of a falsehood that people can come to accept.

Source details

—

URL

Visit Source

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.

Detailed AnalysisPremium Feature

Get an in-depth analysis of content accuracy, source credibility, potential biases, contextual factors, claim origins, and hidden perspectives.

Create a free account to unlock premium features.

Methodology