If I had a billion dollars to throw away, I’d start an airline where all passengers would be encouraged to sleep through the flight. Aircraft seating would be arranged so that all passengers would have comfy recliners with the required space to make them comfortable. No row would have more than two recliners. Of course, the number of passengers aboard would likely be small. No caffeine nor alcohol would be served. An over-the-counter sedative could be purchased. No food to speak of. No in-flight movies, though perhaps serene videos and headphones with relaxing muzak. Strict limits on carry-on baggage. No animals.
Actually, way back in the early days of commercial flight, some companies had sleeper berths for transatlantic flights.
As far as sleeper berths now Airbus is working on it. But the sleepers will be in the hold area.
Reminds me of the SciFi movie "Fifth Element" in an early scene where passengers boarding a starliner, are placed in sleeping berths, and knocked out for the duration of the flight.