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I have heard of that as a correlation without proven causation. People with health problems might need more sleep perhaps.
by theonemind 8y ago
I have heard of that as a correlation without proven causation. People with health problems might need more sleep perhaps.
- jimmy1 8y agoI 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.
- doodhwala 8y agoCould 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.
- jpmoyn 8y agoRegardless, just as he said above: a correlation doesn't necessarily indicate a causation.