Evolutionary Evidence

The video discusses REM sleep behavioral disorder, where the paralysis during REM sleep is impaired, causing individuals to act out dreams, sometimes violently. It highlights the evolutionary importance of sleep, despite its vulnerabilities, quoting Alan Rexhaffen on sleep's vital function. Sleep's persistence across species suggests its essential biological role, alongside eating, drinking, and reproducing, though its exact purpose remains a mystery.

Why is sleep considered essential at a biological level despite its vulnerabilities?

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What is the significance of sleep being observed in every species studied to date?

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