On the morning of December 1, 2013, a Metro-North passenger train derailed in the Bronx. The accident killed 4 passengers, injured 61, and caused $9 million worth of damage. Investigators determined human error was to blame: the train engineer admitted that before reaching the curve he had "gone into a daze," allowing the train to travel at three times the posted speed limit (8). A medical examination conducted after the accident diagnosed the train engineer with OSA, which hampered his ability to fully adjust his sleep patterns to the morning shift he had begun working just two weeks prior to the accident (9).