This problem is going through all teenagers. Many teenagers are not getting enough sleep at night and they are dropping out school. Many teenagers are not attending in class because they will sleep in class and when the final exams come they don’t know anything.
So the sleep foundation team found out that if they move the bell time to 8:30 from 7:30 it would be better for student and they found out that the numbers out drop outs decreased and students started to attend well. The benefits of this change are:-

Students stopped dropping out.
Student started attending well.
Student stopped being late to class.