From How Barack Obama Gets Things Done by Sean Blanda:
“I don’t want to make decisions about what I’m eating or wearing,” he told Michael Lewis. “Because I have too many other decisions to make.”
In decision making and psychology, decision fatigue refers to the deteriorating quality of decisions made by an individual, after a long session of decision making. It is now understood as one of the causes of irrational trade-offs in decision making. For instance, judges in court have been shown to make less favorable decisions later in the day than early in the day. Decision fatigue may also lead to consumers making poor choices with their purchases.
Note: This is one of the reasons why it’s important to delegate goals, not tasks. You can’t make decisions for everyone in your company.