As a teenagers your body clock gets messed up; you don't want to go to sleep early however you love to have a ly-in in the morning, this is because of a hormone called Melatonin aka 'the darkness hormone'. This hormone is produced in the brain and is the thing which helps you fall asleep. In adults, Melatonin is usually produced at around 10PM however among teenagers it is 1AM!
Out of children, teenagers and adults, teenagers are actually the ones who need the most sleep because it is whilst we sleep when a hormone is released which is essential if we want to grow. So, technically, the more sleep you get, the more likely it is you will have a growth spurt.
Stereotypical teenagers are seen by both adults and children as moody, depressed and quite impulsive. These are all side effects of being sleep deprived. This is why a few schools in America have pushed back the time of their morning lessons so teens can get a couple more hours in bed. Not only did the students become more enthused, the school also saw an improvement in grades!