Utafiti Umeonyesha Kumbe Marubani wa Ndege Huwa Wanapitiwa na Usingizi Wakiwa Angani Wakiendesha Ndege

Between 43% & 54% of pilots surveyed in the U.K.,Norway, and Sweden admitted to have fallen asleep while flying a passenger plane.
One third of them stated that when they woke up, they discovered that their co-pilots had also fallen asleep.