I'm not insignificantly of Scandi descent on both sides of my family, so I dare say that accounts for something in terms of feelings towards light. There's Cypriot, Sudanese and Ashkenazi Jewish too, but heavily Scandi.

I do enjoy sunlight, but a lack of it isn't the end of the world for me. The world keeps on spinning, I don't become dysfunctional from a lack of light, though my mood is elevated by it like anybody.

Thinking about it for a few hours, yes, I would happily go and live in a cave for a few years. Wouldn't want to spend my entire life there as I feel I'd miss out, but yes, wouldn't bother me much. I'm very comfortable with being on my own.