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Re:Why Seven Hours of Sleep Might Be Better Than Eight by falcolas on Tuesday July 22, 2014 @12:18PM (#8069742)
So, the article starts, and ends, with recommending 7-9 hours of sleep. Everything in between mostly supports those two values.

What's the real answer, proposed by reality and this article? Find out for yourself what your sleep duration should be.

Seems to me that the real purpose of this article was to remind folks that 5 hours is generally not going to be enough sleep, and 10+ hours might be a sign something's wrong.

To add to anecdotal evidence: What's worked for me is having a set wake-up time every single day of the week, and going to bed when I'm tired. Turns out I naturally want right around 8 hours of sleep, give or take 30 minutes on a day-to-day basis.

Re:Why Seven Hours of Sleep Might Be Better Than Eight by blarara on Tuesday July 22, 2014 @03:02PM (#8070937)
but how do we know much of that "naturally" is actually from decades of sleeping ~8 hours of day