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It’s the most classic question asked of any business person, but especially of people who work in IT. “What keeps you up at night?” Even if you work 9 to 5, all IT people have to worry 24/7 because a problem can happen at any time. Eager to know what stresses out an IT pro at 3am, I asked them. Here are their answers from the Interop show floor in Las Vegas this year.

Stock photo of insomnia guy courtesy of Shutterstock.