3 ms·This was a big fad with air traffic controllers a few years ago.by matterhorn 14y agoThis was a big fad with air traffic controllers a few years ago.eru 14y agoDo you have any more details?dhstylez 14y agoReference 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...