My difficult child is somewhat similar (especially the last couple of months). Once up in the morning he is extremely manic-like until about 10:00 in the morning. He often is falling asleep at school around that time for about 45 minutes. However, he makes it through his afternoon somewhat less manic. He is getting plenty of sleep at night (thanks to his medications because otherwise the boy would not sleep). He also refuses to do much of the work. What little work he does bring home, most of the time he doesn't do. Still, I believe much of this is due to his bipolar but, in my difficult child's case, I think some of his fatigue is due to the medications.