Do you have to wake him in the morning? If so I guess earlier bedtime. I'm assuming he has to be up a certain time for school and you're not dragging a tired kid out of bed for no reason. Be thankful you have this problem and not my kid, who goes to sleep at 9:00 and is NOT tired at 7-8am. We had to kill his last nap before 3.5 because he was wide awake at 11pm.