Thesis:People who sleep a 8 hours every night feel more energetic during the day
Source
1.http://www.lookchem.com/Chempedia/Health-and-Chemical/2924.html
3.http://www.thedailymind.com/health-at-work/staying-up-late-why-everyone-should-go-to-bed-earlier/
4.https://answers.yahoo.com/question/index?qid=20070122083555AAvSKd5