Reference to air traffic controllers falling asleep at work. http://travel.usatoday.com/flights/story/2011/04/Another-air-traffic-controller-falls-asleep/458434

Reference to air traffic controllers falling asleep at work. http://travel.usatoday.com/flights/story/2011/04/Another-air-traffic-controller-falls-asleep/45843484/1 http://travel.usatoday.com/flights/story/2011/04/Another-air...