i can beat this. my dad was an RAF Vulcan captain and he and his entire crew fell asleep overflying Indonesia going from Australia to UK (they had being delivering to Australia a rocket component in the Vulcan's capacious bomb bay). the flight over Indonesia was completely illegal, but the crew figured that the Indonesian radars could not track the Vulcan (early stealth) and their fighters could not intercept it.
anyway, everyone woke up (reason for sleep never identified, afaik - i suspect hangovers)
anyway, everyone woke up (reason for sleep never identified, afaik - i suspect hangovers)
this would be mid-60s.