I haven't had much direct personal experience with bratty, but that may be because I seldom hang out in places where kids would go or want to go.
But this lack of sleep phenomena here fascinates me, and has produced the theory that maybe at least one of the reasons Argentina is still a developing country, since it has every reason to be developed already, is because the population is too sleep-deprived to do much work during the day, and too brain-dead to think creatively at work. Sloppy brains produce sloppy work habits, which lead to crumbling infrastructure. It's not about money, it's about the inability to think at anything near full capability. Everybody rocks at night when they party, then sleepwalk through the day. If rocking the night away is one's definite of the good life, then fine, but you can't at same time complain that nothing gets done, the society has no creativity, and the the country is crumbling around the edges.
There isn't a medical study I am aware of that doesn't make it plain and clear that in order to function anywhere near one's full mental capacity, the brain needs from 7 to 9 hours sleep a day, and that includes about 4 hours of deep sleep -- so little naps don't count. It is also medically proven that eating large amounts of food late at night are the source of many gastrointestinal problems and produce fast track weight gain. So how does this society function?
My classic example is the single mother - daughter family next door. The girl appears to be maybe 15 or 16. Often I see her all dressed up and heading out for the evening at just about the time I am getting into bed. I awaken early by habit, and just as frequently I see the TV light in her room flickering at 6 a.m. She leaves for school, in her little uniform, at 7:45. I have no clue when this girl sleeps.
All this is very interesting, I think, and I wonder about its effect on Argentine society.