The Doctor Who Coaches Athletes On Sleep

The Doctor Who Coaches Athletes On Sleep
Boston Bruins players pose with the Stanley Cup and championship banner prior to facing the Philadelphia Flyers on opening night in an NHL hockey game in Boston, Thursday, Oct. 6, 2011. (AP Photo/Charles Krupa)
Boston Bruins players pose with the Stanley Cup and championship banner prior to facing the Philadelphia Flyers on opening night in an NHL hockey game in Boston, Thursday, Oct. 6, 2011. (AP Photo/Charles Krupa)

On June 14, 2011, Dr. Charles Czeisler stood by the side of a small stage, listening as a colleague introduced him to a crowd of fellow researchers. Just as he prepared to ascend the steps, his cell phone vibrated in his pocket. He's not sure why he answered it. Maybe he thought it was an emergency; maybe he just wanted to silence it. Either way, he took the call.

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