Hacker News wrote the following post:

What is the real reason we sleep?

Hacker News Comments: https://news.ycombinator.com/item?id=11325771

Source: http://www.bbc.com/earth/story/20160317-what-is-the-real-reason-we-sleep

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What is the real reason we sleep?

It is surprisingly hard to pin down why we snooze, partly because sleep does so many good things that we can't tell which is the crucial one