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"While multitasking may seem to be saving time, psychologists, neuroscientists and others are finding that it can put us under a great deal of stress and actually make us less efficient."

2008 multitasking study. From the conclusion: "Our results suggest that interruptions lead people to change not only work rhythms but also strategies and mental states. Another possibility is that interruptions do in fact lengthen the time to perform a task but that this extra time only occurs directly after the interruption when reorienting back to the task, and it can be compensated for by a faster and more stressful working style."

2006 Time article on ... you guessed it.