Rethink Your "Variety Is the Spice of Life" Approach

The old routine: You try to keep your days unique from one to the next.
The new habit: Automate at least one daily decision (breakfast is a great place to start)
Why you'll be happier: The more choices you have to make in a day, the more your stamina, judgment, emotional self-control—and your happiness, by extension—get sapped. As psychologist Roy Baumeister explained, the willpower you use in decision-making is like a muscle that gets fatigued. One less choice to make means a little more juice in the tank.