Rock climber; first person to free solo El Capitan
No, I don’t really worry that much when I sleep. I mean, the stuff that I get stressed about is all like real life stuff with, you know, dealing with email and responding to calls and like, you know, hustling and I don’t know, like doing my taxes. You know, like all the stuff that I’m just like not good at.
Tim Ferriss, The Tim Ferriss Show, The Blog of Author Tim Ferriss, 1 January 2018 source ↗