Proximity to light most likely means proximity to society and all the byproducts of civilization. If it turns out lights at night cause alzheimers I'd be stunned.
Poor sleep consistency/quality and interrupted circadian rhythms have already been found to be associated with a higher risk of Alzheimer's, so artificial light could definitely be contributing to a previously identified risk factor. I am sure there are other variables at play that are associated with light sources, too, but it is definitely possible/even likely that the light itself is an issue.
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