In belgium my school started around 8.30, which meant getting up at 7.30 in my case. I always had a very hard time waking up and was often tired during the day. However in summer, time in Belgium is 2 hours ahead of what's considered 'natural time'. In winter, with DST only 1. Summer or winter, I was always just as tired. Now I need to wake up at around 8.30 for work. I'm still just as tired, since I just go to sleep later. So I'm doubtful this will help much since in my experience the hard part is going to bed early enough.