SLEEP in Fairfax will trash these multiple scientific studies in 3... 2... 1...
Several sleep studies have found that seven hours is the optimal amount of sleep—not eight, as was long believed—when it comes to certain cognitive and health markers, although many doctors question that conclusion.
http://online.wsj.com/articles/sleep-experts-close-in-on-the-optimal-nights-sleep-1405984970?mod=WSJ_hppMIDDLENexttoWhatsNewsSecond