Sleep is a biological process that is close to many of our hearts, but scientists haven't yet cracked all its secrets. In fact, https://www.semel.ucla.edu/sites/all/files/sleep-research/sciam2003/sciamsleep.pdf we still don't even know why we sleep. Thus, one-third of our lives is a complete mystery.
Of course, sleep--or at least something that looks an awful lot like it--is pretty common: not just among humans and our close relatives, but also among https://www.semel.ucla.edu/sites/all/f
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