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Chennai's extremely hot. Having been there, intuitively I'd suspect a Spain-like siesta would work very well there and boost productivity.

The nights there are extremely warm too. I wonder if that's a factor in ensuring that 5.5 hours of sleep is no worse than 8?

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I don't know how well it compares to a spanish siesta but the abstract ends with "In contrast, short afternoon naps at the workplace improved an overall index of outcomes by 0.12 standard deviations, with significant increases in productivity, psychological well-being, and cognition, but a decrease in work time."

*5.5 vs about 6. The study increased their sleep by 27 minutes, they were still under-slept by 2 hours.

AFAIK not anything below 8 hours qualifies as “under-sleeping”; instead, the need of sleep typically varies between 6 to 9 hours for healthy adults.

Which averages out to 7.5. So the average should have been in that range with outliners at 6 and 9

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