Delaying School Start Time By One Hour Positively Affects Adolescents' Cognitive Performance

I believe that. Sleeping an hour later certainly improves my cognitive performance. and I'm no teenager.

http://www.sciencedaily.com/releases/2008/06/080612070445.htm

ScienceDaily (Jun. 13, 2008) — Delaying an adolescent's school start time by one hour has a positive effect on his or her cognitive performance, according to a research abstract that will be presented on June 12 at SLEEP 2008, the 22nd Annual Meeting of the Associated Professional Sleep Societies (APSS).