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The study, published in The Lancet Neurology, shows a previously unobserved relationship between body temperature and REM sleep, a period of sleep in which the brain is highly active, said Siegel, director of
Birds have the highest body temperature of any warm-blooded animal, reaching 41 degrees, while they have the least amount of REM sleep, at just 0.
Brain temperature drops during non-REM sleep and then rises
Compared to other thermostatic animals, the rembouncular sleep duration in humans is neither high nor low, "which undermines some popular belief that REM sleep plays a role in learning or mood regulation," he said
Sleep function: an evolutionary perspective.