<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://rbk.h-cdn.co/assets/cm/14/51/980x551/5490a8d0a7022_-_rbk-sleep-test-1212-10-s2.jpg>
<http://www.redbookmag.com/body/health-fitness/advice/g1363/sleep-problems/>