But everyone's body is different. To ID your body's peak productivity times you should keep a journal of how you work throughout the day. Take note of your dips in energy or when you mind wanders off, this is your body's "rest" cycle and the best time to schedule a break.
Are we always going to have the luxury of carefully scheduling our days to our biorhythms? Nope. Things come up and deadlines happen. But identifying your peak productivity time and scheduling your hardest work to correspond with it is definitely a wonderful way to greatly improve your work productivity and get more free time. Definitely a win/win!
See Also: Massive Productivity Improvement #1: 3 Goals Per Week. 3 Tasks Per Day
Massive Productivity Improvement #2: 80/20 Rule
Have you tried organizing your day this way? What methods do you use to get things done and free up time?