I was thinking that on a long haul overnight flight what people really want is a bed rather than a seat. So why don't the airlines provide beds? It wouldn't have to take up more space. They could be stacked up 3 high like in a train. Perhaps they could fold down as well to become seats for take off and landing.
How would it work it coach? Your head against the window and your feet sticking into the aisle? What happens if you have to go to the bathroom? Would the flight attendant bring a bedpan and then empty it for you?
"I tell you this, no eternal reward will forgive us now for wasting the dawn." Jim Morrison