If you work better in the mornings, is it possible to arrange things so you get to sleep and wake up a little earlier? Not ridiculously so, but if moving work time from night to morning lets you use it more efficiently...

(I did exactly this entirely by accident. The trouble was the part where it made it easier for me to forget assignments that needed doing, so while I got things done with less mental strain and without so much time wasted internally, there were more assignments that just got missed. A simple written agenda would probably avert this risk.)