I'm no exception. An eight-hour work day is a light day for me. As I type, I've already been at work (the school I teach at) for eleven hours, and yes I'm sneaking a minute from work to do some blogging- a different job, but still a form of work.
Overwork and stress are the single biggest enemies to the creative mind. A writer might force themselves to sit at their computer for seven hours a day, but are they writing well? The important thing isn't even to just get rest, the critical detail for a writer is to have enough to actually daydream.
I remember a music theory class I took in college, where the teacher insisted the only important thing in one piece we were studying was the rests. In the creative process, the mind needs time to build, to dream. Forcing an overworked mind to pump out information, doesn't lead to better creation, or even necessarily to more creation.
Every time I sit down to write, I try to spend at least a half hour thinking of nothing. I let my mind wander. Perhaps I'll go on a walk, or perhaps I'll meditate. If I don't have time during a busy workday to have this creation time, I still spend at least ten minutes before I sleep allowing my mind to go anywhere. Little by little, the fires of the creative process are fanned, and the creation improves.
What moments of rest work for you?