SPORTS
04/23/2014 10:54 am ET Updated Apr 25, 2014

The Doctor Who Coaches Athletes On Sleep

ASSOCIATED PRESS

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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