My experience mirrors this. I get through a lot more work and admin in a given day if I work from 7am-4pm, especially if there's a lot of drudgery involved. In

My experience mirrors this. I get through a lot more work and admin in a given day if I work from 7am-4pm, especially if there's a lot of drudgery involved. In contrast, if I work from 9am-6pm or later I'm more likely to procrastinate but I get a spurt of creativity that starts in the late afternoon and gets amplified at night. So I try to structure my work day around that, using early mornings to race through necessary but boring work and to tie up the remaining loose ends from the day or night before while leaving particularly challenging problems for later in the day or the evening. Not to mention that the feeling of getting a bunch of tasks out of your way early in the morning usually acts as a potent motivator for the rest of the day.