If I'm tired, I can fall asleep anywhere, anytime.
Plane taking off. Or landing. Or during flight.
On the bus.
In a movie theater.
On a Disneyland ride, waiting for it to start.
In a car, stopped in traffic waiting for an accident to clear (this is as true as it gets. I was taking one of my sons and his coworker to work in a town down the highway. We turned on the interstate, and a bad accident had stopped traffic cold. I fell asleep with the car stopped in place, and woke up when my son said, "Dad, traffic is starting to clear.")
Getting home, waiting for dinner, on the living room rug, my feet up on furniture.
And so on.
The kids call it my superpower. But what I know is, if I allow myself to do that in public, I'm going to look ridiculous to everyone else. Such is the price to pay for such a superpower.