| Boeing 777 has a watchdog timer that issues an aural alert if none of the pilot/avionic interfaces are touched in a specified period. Why? To ensure that your highly trained pilots don't snooze together on those long oceanic/remote area flights.
Lesson: This is not anything new. In fact they use system engineering to reduce the risk of it occurring. Because it does occur. Often.
__________________ 
"Some people spend an entire lifetime wondering if
they made a difference in the world. But, the [U.S.]
Marines don't have that problem."
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Pilots Asleep in the Cockpit 
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