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Human Body Facts

Sleep Facts


Humans spend about one-third of life asleep
During REM sleep, your body is temporarily paralyzed
Learning physically strengthens synaptic connections
The brain’s glymphatic system clears waste mainly during sleep
Your brain never truly turns off during sleep
Yawning may help regulate brain temperature
Deep-sleep brain waves slow to about 1–4 cycles per second
A good night’s sleep can improve next-day problem solving

Sleep