Hagetaka's mild disapproval went completely ignored as Dan went back to work, tapping and thinking a bit slower for the distraction and lack of sleep. Sure, there were plenty of other stimulants he could be taking. Stronger ones, too, but those were saved for his men and owed themselves better to fighting for days straight and marching on the verge of starvation than tedious deskwork. That's to say nothing of the strange effects they had on those who used them a bit too often. No, coffee would do just fine. It'll just perk those... Heavy eyelids... "Zzz-hrnk! Huh? No, no sleep yet. Gotta get this done."