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Dreamland: What Happens While You Sleep and How It Affects Your Every Waking Moment

Dreamland: What Happens While You Sleep and How It Affects Your Every Waking Moment
by Maria Popova “We are living in an age when sleep is more comfortable than ever and yet more elusive.” The Ancient Greeks believed that one fell asleep when the brain filled with blood and awakened once it drained back out. Nineteenth-century philosophers contended that sleep happened when the brain was emptied of ambitions and stimulating thoughts. “If sleep doesn’t serve an absolutely vital function, it is the greatest mistake evolution ever made,” biologist Allan Rechtschaffen once remarked. Even today, sleep remains one of the most poorly understood human biological functions, despite some recent strides in understanding the “social jetlag” of our internal clocks and the relationship between dreaming and depression. Most of us will spend a full third of our lives asleep, and yet we don’t have the faintest idea of what it does for our bodies and our brains. Lions and gerbils sleep about thirteen hours a day. What, then, happens as we doze off, exactly? Donating = Loving

http://www.brainpickings.org/index.php/2012/08/21/dreamland-science-of-sleep-david-randall/

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