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I have got to look for it again and do some searches on the subject which I have not had time to do as yet, but I recall a suggestion that darkness (is that sleep or darkness) has links with omega six utilisation - eg it drops in sleep.
I also have questions - what about people that live in northern and southern latitudes - Town and country side - office workers who get little day light etc. So many questions - (image of the eskimo in the car advert comes to mind!
I wonder if it may be more to do with quality and amount of sleep and the body's need for downtime to repair, stress of irregular hours etc (I am not denying it could have a part to play but have many questions as to the simple proposition it is just lack of darkness.)
When I have time to check it out I will come back.
RB
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