Breaks are very important but as well have alot of inspirational and motivational objects around your work area so you don't have to stare at the same thing for hours on end...
like toys or posters, work you admire, concept drawings and reminders of your dreams and goals for the project or for long term. Even turning off the light will stir some imagination.
"Whatever tomorrow brings I'll be there...with open arms, and open eyes" - Incubus