The engineer in charge of the train that crashed in Hoboken, NJ on Sept. 29 may have had an undiagnosed sleep disorder. According to his lawyer, the engineer, Thomas Gallagher, has severe sleep apnea which was only discovered in the testing that took place after the accident. Sleep apnea was ruled to be the cause of the 2013 Metro-North Railroad crash, where the engineer fell asleep as a result of the condition.