There’s the noise. There’s the bright fluorescent hallway light. And there’s the unending barrage of nighttime interruptions: vitals checks, medication administration, blood draws and the rest.

Peter Ubel, a physician and a professor at Duke University’s business school, has studied the rational and irrational forces that affect health. But he was surprised when hospitalized at Duke in 2013 to get a small tumor removed at how difficult it was to sleep.

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