For me, specifically, in my psychology class we had to keep track of how many hours of sleep we got per month and then average it. What I found out is that I get about 6.75 hours of sleep per night. That is well under the minimum recommendation. Many people in my class had similar totals and the National Sleep Foundation found that only 15% of teenagers where consistently getting enough sleep.
This can cause a plethora of problems beyond just the generally feeling of grogginess. If a teenager is not getting enough sleep they are at a higher risk of depression and anxiety according to a recent study by the University of Rochester.
So what can be done to fix this problem? Obviously, teens themselves should work on getting to sleep earlier if at all possible, but I think later starts to school days and shorter school days in general may be the answer.
Many teens will tell you that they would like to get more sleep but are swamped with after-school activities such as sports, clubs, jobs, and (of course) homework. Having a later start would allow teens to sleep in more and be more productive at school. A shorter school day would give teens more time for their after-school activities.
The entire solution is much more complex I am sure, but I think it is time that we finally take this issue seriously and give it the attention that it needs.