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The insane stress levels from being in their situation also affects cognition.

So I am not surprised if merely looking at sleep amounts fails to explain differences.

Highly likely this is a confounding factor - and compensating for it is essentially every decent policy for the last 50 years in the West.

There is also a dynamic systems side to sleep rhythms. Quite likely there are stimuli you can randomly experience that shift your sleep cycle into a chaotic regime and then you need a good knock to the light and activity levels to reset to stability.

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