Humans sleep significantly less than other primates, averaging around 7 hours compared to the predicted 9.5 hours based on brain size and metabolic demands. This phenomenon, known as the human sleep paradox, is attributed to increased safety afforded by sleeping in groups and later in shelters with fire. This enhanced safety allowed human sleep to become more concentrated and efficient, with a larger proportion spent in REM sleep, which is crucial for processing emotional memory. AI
RANK_REASON The item discusses a scientific hypothesis about human sleep patterns based on existing research, rather than presenting new findings or a release.
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