I learned that sharks sleep parts of their brain, like rolling blackouts; they can’t fall asleep because they can’t stop moving or they’ll suffocate. So they sleep sections of their brain at a time. So I do kind of a version of that, where I shut down brain centers. I literally tell myself, “Don’t logistically problem-solve for the next three hours, but you can talk to folks. Driving my kid home from school—don’t think about all the professional things you have to do.