- REM sleep is possible because humans sleep on the ground, not in trees like primates, which makes it safe for us to enter paralysis
- Sleeping on the ground is still risky, hence the intensification and moderate shortening of our sleep patterns
- REM sleep helps us make sense of our experiences and store long term memories which is necessary for our species high sociocultural complexity and intelligence
— Jun 18, 2026 02:00PM
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