<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x787/5490a8d11c05e_-_rbk-sleep-test-1212-11-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1363/sleep-problems/>