I am a middle-of-the-night smartphone user. I know I'm not alone. The tech industry is accused these days of deliberate "brain hacking" to encourage so-called "app addiction." Are those accusations just fear and hyperbole? Or are there true dangers to the way we use our devices? Business Insider is launching a new series to investigate. There was a time not long ago when I considered it crazy to keep a smartphone by the bedside. My phone charger was on a shelf by the front door....


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