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 use ear plugs then put on nose cancelling headphones.
Complete silence. I didn’t hear the crying baby that was screaming for the 10 hour flight until the last hour lol.