I think, overall, this is true of all people (especially Americans). Few of us get enough sleep. And Teenagers certainly are a big group that don't get enough.
Drive's my kids that I get them in bed every night for 9 for the most part (waking up at 6:30-7), but it's for their best health.
MM16 OVR: 106 Off: 106 Def: 107 ST: 104 team: http://www.muthead.com/madden-mobile/16/lineups/31592-madden-mobile-team
MM17 OVR: 110 Off: 110 Def: 112 ST: 105 team links: Offense / Defense / Special Teams
Commish of League: The Who Dat Nation