I can fall asleep almost anywhere. I routinely fall asleep in the break room at work. Once, I was helping a friend fix his car, and I fell asleep on his garage floor when he went inside to get water.
But in a hot metal tube tearing through the sky, with my neck all kinked? Get out of here, man.
The jet engine noise puts me to sleep. Those sweet delta waves.
I fly jetBlue or Southwest; no Delta for me.
For real. I sometimes put plane engine noise at home as background noise to fall asleep