Some answers here:
http://uonews.uoregon.edu/archive/news-release/2014/3/sleep-quality-and-duration-improve-cognition-aging-populations
"This study (SAGE) is hugely powerful and so different from what's been done in the past, simply because of the consistency of how the data was collected — multi-national, random samples of people. Sleep is something that is important but often undervalued in our society. We're just now scratching the surface on what patterns of sleep normally are, and also what are these associations between sleep and health issues. The study, based on the first wave of data from the project, focuses on people 50 years old and older in China, Ghana, India, Mexico, the Russian Federation and South Africa. The main findings are:
• Individuals sleeping less than six hours and more than nine hours had significantly lower cognitive scores compared to those in the intermediate group.
• Men reported higher sleep quality than women in all six nations, with men and women in Mexico reporting the highest.
• Women reported longer sleep durations than men in all countries, except Russia and Mexico. Men and women in South Africa slept longer than in any other country. The fewest sleep hours for both sexes occurred in India.
That exactly we at International Institute of Sleep Sciences, Mumbai, India are trying to find out with our current research project dealing with effect of chronic sleep deprivation on cognition. Our findings till now agree with your observations people sleeping less than 6 hours show deteriorated pre-frontal lobe functions. Very soon we will be able to publish this data.
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