Teenagers have a biological tendency to go to sleep later, as much as two hours later, than their younger counterparts. Their natural time for bed is around 10:45 pm and the brain remains in sleep mode until about 8:00 am. Since studies have found that teens need more sleep and if  given their gpas will go up therefore school districts should consider starting school later. If school started later the Academics would improve greatly and students mental and physical health would improve. Not to mention the countless amount of research scientists and college professors have done.