It may not be the best strategy to stay up late and cram. A new study finds that when teens don't get the sleep they need, all kinds of things can go poorly. http://www.npr.org/blogs/health/2012/08/22/159435167/high-school-daze-the-perils-of-sacrificing-sleep-for-late-night-studying?ps=rec&ec=mostpopularnews