The National Transportation Safety Board (NTSB) says a new poll about the role of sleepiness and errors should serve as a "wake up call" for the transportation industry.

For the first time, the National Sleep Foundation (NSF) asked transportation professionals about their sleep habits. Nearly one-fourth of pilots and train operators admit that their performance is affected at least once a week by sleepiness. Moreover, one in five pilots acknowledge a serious error, and one in six train operators and truck drivers say that sleepiness has led to a near miss.