Not likely! Many districts around the country have changed start times and the fact is that teens get more sleep when start times are later. Wilton, for example, changed start times in 2006. Bedtimes remained constant and wake times shifted later. A 40 minute change in start time resulted in 35 minutes of additional sleep on school nights.
"Just as people who are hungry will eat more when given the opportunity, people who are sleep deprived will get more sleep if you give them a chance." Rafael Pelayo, MD, Stanford University School of Medicine