Suddenly, after years of planning, managing, exceeding goals and conquering challenges, you realize that you no longer really care very much about your work. Formerly exciting activities, such as leading, influencing and innovating, don't matter much anymore. These days, your biggest work-related thrill is playing the games you find on Slack.

There's a word for this feeling. It's called "burnout."

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Jack Bedell-Pearce, managing director of 4D Data Centres, a U.K. data center operator, is familiar with the causes and consequences of burnout. Having co-founded the company over a decade ago, he says he has burned out more than once and learned some important lessons each time.

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