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A comment on The Effect of Sleep on Happiness. Parent comment

Re:The Effect of Sleep on Happiness by jimmy1 on Wednesday July 18, 2018 @03:37PM (#17561446)
I believe it was a study done on workers in Japan, they found the sweet spot was 7 hours. People who slept 8-9 were at higher risk for health issues.than those who slept less.
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Re:The Effect of Sleep on Happiness by jpmoyn on Wednesday July 18, 2018 @05:13PM (#17562111)
Regardless, just as he said above: a correlation doesn't necessarily indicate a causation.
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Re:The Effect of Sleep on Happiness by doodhwala on Wednesday July 18, 2018 @04:52PM (#17561962)
Could you provide a link?

What if the people who slept less happened to be from the working class who lead a more active life? And the ones who slept 8-9 were those of an older age group who might not be taking care of their lifestyle.

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