We've all grown up hearing that eight hours is a good nights rest, and any less can lead to grogginess, crabbiness, and the dreaded "nodding off in a meeting." But...is it true? Is it natural or healthy to sleep for eight straight hours every night or have humans, over time, developed sleeping habits and sleeping myths at odds with the natural order?
http://www.bbc.co.uk/news/magazine-16964783
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