post evidence / reasoning, and I'll decide based on evidence at the end of a week
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REM sleep seems correlated but not the same as dreaming though - in humans, dreaming can but does not always happen during REM sleep.
I like the working definition of "what is a dream" from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8211436/ : "patterns of neural activity, predominately within the cerebral cortex, that form transient imagery, experienced as conscious thought, that can be considered mental representations (Morgan, 2014), occurring during physiologically defined sleep". Not sure about the conscious thought part, but patterns of neural activity that form transient imagery during sleep sounds like a pretty reasonable starting point.
@Duncan Slightly off-topic, but REM in spiders: https://www.pnas.org/doi/10.1073/pnas.2204754119
https://www.youtube.com/watch?v=Jqqain8Ti4A this video seems to insinuate that they have aspirations
Found one study on aquatic mammals (not directly relevant to turtles): https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8211436/. I still don't really know how to interpret it, but it offers some reasonable approaches to the question I think.
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