Are you an early bird or a night owl? Do you thrive on jumping into tasks before the sun is even up and the house is still quiet or are you better suited to working when the moon is high in the sky and the rest of the household and the world are asleep?
Knowing the type of individual you are will help you be more productive and energized. If you're a night owl, forcing yourself to get up and jump into a complex task first thing in the morning will likely lead to frustration and burn out. Once you understand your inner workings, it's easy to schedule your workday and plan your most energy draining activities for the part of the day when you're most alert and productive.
I know that I work best in the morning, after I've had a cup of coffee. As a matter of fact, as I jumped into NaBloPoMo on January 1, I spent quite a bit of time writing several posts and scheduling them ahead of time. My energy and enthusiasm were high and I didn't have any client work pressing so I took advantage of both of those benefits.
When do you perform at your peak? Have you structured your day to take advantage of that?