“The start time for school needs to be developmentally appropriate. Most teenagers are sleep-deprived and it’s not just because of gadgets or stubbornness, but because of their biology and being required to wake up early for school.
“It’s no surprise that when teenagers go to school they are sleepy, they are tired, they can’t learn as well, they can’t remember what they learned the day before, and they are not as safe driving to school. As I noted earlier, sleep helps with emotional healing so sleep-deprived teenagers also have emotional challenges. Research has shown that the judgement of facial expressions can be impaired by sleep deprivation, misperceiving a person as being aggressive when they are not. A lack of sleep can cause more negative thoughts, anxiety, and even depression.
“Some states and districts are shifting the start of school to be later, but change is difficult. Bus schedules are hard to change, parents need to get to work and schools get set into a schedule.”
Read more on Teenagers and Sleep – Dr. Irena Keller on How Teenagers are Wired Differently