As far as I know, rural and suburban dwellers do have lightbulbs, computers, televisions, cell phones, and this time of year, brightly lit christmas trees. Is your position that there are more light bulbs in cities than the countryside? Do you have any evidence that that's meaningful? Seems like a bit of a stretch to me, that the external lights—easily blocked by window curtains—have any meaningful impact on health beyond the artificial light sources we all deliberately use.