Means you should be optimizing vitamin d during the summer months to create storage for the winter.

Also you should be embracing the cyclical relationship of melatonin during the winter (when increased darkness is the norm) - melatonin can actually bind to the vitamin d receptor and act as an antioxidant. (pmc.ncbi.nlm.nih.gov/ar…)

This entire situation shows how not only do we not respect light in the summer months when UVB is most abundant at northern latitudes, but then we synonymously don’t embrace darkness in winter thus creating a negative feedback loop we can’t escape

But know better and you can do better