flightglobal has a story about sleep cabins as a concept.
I'm not sure these bunks are going to be successful. It's all a bit impersonal. Give me business class all the time.
It reminds me of St Trinians' boarding school dormitories.
Story here:
http://www.flightglobal.com/articles/2007/07/17/215551/picture-lufthansa-explores-interest-in-proposed-all-sleeper-economy.html
AirSpace - more than just hot air