America isn't the only one with sleep problems. Aku has never had problems with sleep before but now that he actually has to do it in order to 'recharge' his powers, he's having trouble keeping an adequate schedule and often nods off when things get too quiet.

Presently, he's slumped over the table a few seats down from America and snoring quietly into a book about inter-dimensional time travel and its effects on biological organisms. But the sounds of choking eventually stir him out of his slumber. The demon grumbles irritably at the disturbance and scowls at the fool caught in America's grip.

If this struggle was a bit quieter, he'd be content to ignore it. But since it isn't and he's extra grumpy, Aku roars loud enough to rattle the entire library:

"SILENCE!"