How overwhelming the research really is? The article links to this page http://sleepfoundation.org/how-sleep-works/how-much-sleep-do-we-really-need/page/0%2C2/

How overwhelming the research really is? The article links to this page http://sleepfoundation.org/how-sleep-works/how-much-sleep-do-we-really-need/page/0%2C2/ http://sleepfoundation.org/how-sleep-works/how-much-sleep-do... which as it seems cites just a single study > Researchers Shawn Youngstedt and Daniel Kripke reviewed two surveys of more than 1 million adults conducted by the American Cancer Society...