According to most researchers, adolescents need about 9 hours of sleep a night to function optimally—to be physically, mentally and cognitively healthy. Tell this to nine out of ten teenagers (or their parents) nowadays and they will laugh! What teenager has time to sleep for 9 hours a night during the school year??
The problem is that lack of sleep makes teenagers more vulnerable to moodiness, risky behaviour and poor judgment.
Here are a few tips about what parents can do to to help teenagers develop better sleep habits: http://www.childmind.org/en/posts/articles/2014-8-26-starved-sleep-10-tips-helping-sleep-deprived-teens