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.
I like what comedian Ismo said, there are two types of people: people who can sleep anywhere and people who can’t sleep anywhere. I’m from the first. You seem to be in the middle. I can fall asleep standing up.