trustmebro.to/r/…
✓ checked
trust me, bro:
here is the receipt.
the claim

Sharks sleep.

the verdict
INSUFFICIENT LEANING
Recorded sources
8 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that sharks sleep?

Unclear. Several sources indicate that at least some shark species sleep or rest, including physiological evidence in draughtsboard sharks and accounts of nurse, white-tip reef and Caribbean reef sharks resting. A review notes this evidence is preliminary for some species and absent for continuously swimming sharks, so the general claim is only partly covered.

Verdict: PARTIAL LEAN · 8 sources for, 0 against · Last checked

Evidence for · 8
Do sharks never sleep?
2012
Get citation
Do sharks never sleep?. (2012). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/8595/do-sharks-never-sleep

See more details
More for · 7
The encyclopedia of sharks
2008
Get citation
1952-, P. S. (2008). The encyclopedia of sharks. archive.org. https://archive.org/details/encyclopediaofsh0000park_r0j0

Nurse sharks
1988
Get citation
1955-, P. S. (1988). Nurse sharks. archive.org. https://archive.org/details/nursesharks0000palm

Energy conservation characterizes sleep in sharks
Get citation
Energy conservation characterizes sleep in sharks. (n.d.). api.semanticscholar.org. https://api.semanticscholar.org/CorpusID:247295531

Evidence for Sleep in Sharks and Rays: Behavioural, Physiological, and Evolutionary Considerations
Get citation
Evidence for Sleep in Sharks and Rays: Behavioural, Physiological, and Evolutionary Considerations. (n.d.). cir.nii.ac.jp. https://doi.org/10.1159/000504123

MO2, behaviour data and supplementary material for the first physiological evidence of sleep in sharks
2022
Get citation
Michael, K., Selwyn, C., & John, L. (2022). MO2, behaviour data and supplementary material for the first physiological evidence of sleep in sharks. zenodo.org. https://doi.org/10.5281/zenodo.5223095

I didn't know that sharks keep losing their teeth
1998
Get citation
Claire, L. (1998). I didn't know that sharks keep losing their teeth. archive.org. https://archive.org/details/ididntknowthatsh0000llew

LibreTexts: 02.8: Caribbean Reef Shark
Get citation
LibreTexts: 02.8%3A Caribbean Reef Shark. (n.d.). bio.libretexts.org. https://bio.libretexts.org/Bookshelves/Marine_Biology_and_Marine_Ecology/A_Student's_Guide_to_Tropical_Marine_Biology/02%3A_Common_Fish_in_the_Coral_Reef/02.8%3A_Caribbean_Reef_Shark

Receipt History
held for human review17 Oct 2026
Anyone with this link can read the claim and its public receipt, including any personal information in that text. Open permanent receipt.
Check your own claim
Challenge the receipt
Requests are recorded for review. This does not start an automatic check or guarantee a response time.

Citation formatting by citeproc-js (Frank Bennett) and the Citation Style Language project. Source and licenses.

This receipt is an automated verdict against our published method · not an opinion about any author or publication.
Terms · Privacy · How verdicts work