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.
For real. I sometimes put plane engine noise at home as background noise to fall asleep
I fly jetBlue or Southwest; no Delta for me.