My mothers and sisters sleep too (Spain). But I remember that when I was I child, at my grandfather's house (my granny died before I was born), it was the men that slept because the women were busy in the kitchen doing the washing up. Here I'm talking about big family lunches. Thus, men could sleep because of the macho culture. Fortunately, this changed in one generation, at least in my family. We all clean everything up together and go to have coffe afterwards.