Teenagers (adolescents) around the world only average about 6 hours of sleep everyday! In fact, adolescents need about 9 ½ hours sleep a night to be fully alert. So they keep carrying forward a nearly 4-hour deficit every night!
This explains why most of them drag themselves through high school and college like zombies. It gives us an insight into their moody and lethargic behavior and explains why they are most of the times unprepared or unable to learn. Teenagers actually need more sleep than children because of the significant changes that accompany the transition to adulthood.
You can help your teenagers by encouraging them to follow simple guidelines: