Tim Cook, chief executive officer of Apple Inc., speaks about Apple Watch during an event at the Steve Jobs Theater in Cupertino, California, U.S. (Photographer: David Paul Morris/Bloomberg)

When Your Apple Watch Wakes You Up in the Middle of the Night

(Bloomberg) -- If there’s one thing almost guaranteed to send your heart rate soaring, it’s having a smartwatch wake you up at 3 a.m. with an alert that you might be about to die.

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