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Silent3

(15,909 posts)
10. It's possible that expecting to get most of our sleep all at once...
Thu Dec 18, 2014, 11:48 AM
Dec 2014

...isn't the optimal way to do it, and that sleeping all the way through the night in a single 7-9 hour session of sleep (or at least thinking that's what you should be trying to do) is a fairly modern cultural change brought on by street lighting and the industrial revolution.

http://en.wikipedia.org/wiki/Segmented_sleep

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