Sleep. We all need it, and most of us don’t get enough of it. And even if we get the average recommended amount (the good old 8-hour dosage), that takes up about a third of our lives overall.
But why do we sleep, from an evolutionary standpoint? The fact that it’s so widespread in the animal kingdom attests to it having some kind of vital function. But it just seems like a waste of 8 hours, more or less.Continue reading How and Why Sleep Evolved