Leslie A. Perlow, a Harvard Business School professor, thinks she's found a way to give American workers their lives back. In her new book, "Sleeping With Your Smartphone: How to Break the 24/7 Habit and Change the Way You Work," Perlow chronicles her experiments at Boston Consulting Group. There, she found ways to get extreme workaholics to take more time for themselves -- without, she insists, hurting their work output.

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