http://www.npr.org/2012/10/01/162088696/how-teachers-can-avoid-the-october-blues

http://www.guardian.co.uk/teacher-network/2011/dec/07/teachers-work-life-balance?fb=optOut

“Research by David Dinges at the University of Pennsylvania has found that adults need eight hours of sleep a night – we do not adapt. We just perform at a far lower level than if fully rested. And his research shows that if you have six hours of sleep a night for just two weeks in a row, you become the equivalent of being cognitively drunk. Do you think it’s a good idea going to school drunk?!”