Decision fatigue
Someone is probably going to quote that study where they say decision fatigue doesn't exist, and I'm going to head you off right now: It exists, everyone on HN has experienced it, and one of the best tools a successful businessman has is being able to differentiate between which decisions actually need their input, and none of us use that tool enough.Case in point: it is 2 pm, I am on HN replying to this.Also, someone is going to probably recommend reading "Thinking Fast and Slow". It's not at the top of my list of books to read, but you should read it once just so you understand the references to it.