this article discusses research out of New Zealand regarding sleep deprivation among kids, and habits/interventions to improve sleep:
and on the effects of sleep deprivation on teens:
http://www.apa.org/monitor/oct01/sleepteen.aspx
And on children:
http://www.nytimes.com/2011/05/24/health/24brody.html?_r=1
http://blogs.indystar.com/ypress/2011/05/07/no-rest-for-the-weary-teenagers/