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Not to mention the fact that in many offices, even high-end ones, there just aren't any comfortable places to sit or just be for eight hours, including you're own "ergonomic" chair. It's hard to overstate how fatiguing this can be. Home is everyone's most comfortable place, and if you can leave the computer for a few minutes to ruminate on the sofa, or do the dishes, or walk around the block, it can substantially extend your hours of effectiveness and alertness.