I think that even more important is that this provides an explanation for the obsession with getting less sleep that seems particularly pernicious in start-up c

I think that even more important is that this provides an explanation for the obsession with getting less sleep that seems particularly pernicious in start-up culture, but is noticeable elsewhere as well. It goes beyond merely worrying about the health consequences. It is human biology representing an affront to longer working days and increased productivity.