Resumen de Why humans evolved to need a lot less sleep
The 7 hours of sleep we get every night may not feel like quite enough, but compared with our fellow primates, which spend around 12 hours a day slumbering, humans barely get any shut-eye. It seems we have evolved to limit our sleep, and that may be because we have better things to do, says Charles Nunn at Duke University in North Carolina. But this might have left us susceptible to Alzheimer's disease. Their model calculated that humans should have around 9.5 hours a night. Of this, 8.4 hours would be in non-REM sleep and 1.3 hours in REM sleep -- if we were like other primates
