In her new book, Sleeping With Your Smartphone, Leslie Perlow explains how a small group of high-powered consultants made a concerted effort to disconnect from their mobile devices for a few predetermined hours every week—and how they became more productive as a result. This excerpt from the book introduces the idea the scheduled disconnecting process, dubbed "predictable time off," which helped these phone-addled employees to take better control of both their workdays and their lives.

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