<http://schema.org/description>
"People who get 6 to 9 hours of sleep per night are more likely to give their quality of life high grades, U.S. researchers say."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.upi.com/Health_News/2011/06/15/Key-to-good-life-A-good-nights-sleep/UPI-73601308114248/>