I think the two could be tangentially related. Not necessarily intelligence, but constant thinking and wondering. In my own experience, I loved working on new things and learning new things. I took some time to step away, and wow did I get bored easy, and found myself zoning out thinking, even so far as doing it when others were talking to me. Sleep was impossible, and it was really easy to turn to alcohol just for the mental rest.
Even Elon Musk commented on this recently. Paraphrasing because I don't remember the quote, on Joe Rogan, he mentioned it's not so nice to be him because his mind was always working and he couldn't turn it off. It really hit home for me, and I couldn't even imagine how much worse it is for some folks, especially those who founded companies and have that stress on top.
So true. Towards the end of my doctoral thesis, I found myself brooding and gloomy, and difficult to relate to others. The same mood returns when I am intensely working on something,
Even Elon Musk commented on this recently. Paraphrasing because I don't remember the quote, on Joe Rogan, he mentioned it's not so nice to be him because his mind was always working and he couldn't turn it off. It really hit home for me, and I couldn't even imagine how much worse it is for some folks, especially those who founded companies and have that stress on top.