Hi A-1. I don't know; I was wondering ... 
and I wonder because photographers often think they have the right to take whatever pics they want ... they often just presume the objects of their art don't mind and perhaps are even flattered. Not all photographers; I know some and of others who a particularly sensitive. I still wonder about this particular pic - if the men are genuinely asleep, did they even know they were being photographed? It is a question, and one I still ask.