When it comes to that fog or lack of interest at work, apparently there is solace in community. It turns out that reputable poller Gallup reports 55% of workers are not engaged with their work. (mid 2005) in the USA. Interestingly, The Guardian paper reports 33% of UK'ers are bored at work most of the day. (early 2003)
Human resource and staffing experts reported at 45% of respondants that they had lost people who were bored at their work in one past survey.
What is boredom? This article explores the matter. The sense of boredom the article goes with includes a tedious or fatigue related attitude. So it isn't necessarily lack of something to do or being inactive per se.
It seems like part of this can be overcome with living for Christ in purpose. Philippians 1 addresses some of this challenge to a believer in Jesus. Paul was fatigued (he had plenty to do though) with his missions efforts, not because they were boring but because he knew something better awaited. He changed his perspective and refound his purpose when God convicted him and he felt it necessary to keep up his work efforts, so that others could benefit for his King's glory. Indeed, the above article says focusing on others can help overcome boredom. That sounds like a very decent Christian response, and exactly what helped Paul to have some earthly good later in life.