In 2011, when Jack Dorsey was running Twitter and Square full-time, the cofounder told the audience at Techonomy 2011 that, to got it all done, he gave each day a theme. This allowed him to quickly recall and refocus on the day's task once the distraction was out of the way.
Dorsey said he would take Saturday off to hike and spend Sunday focusing on reflections, feedback, strategy, and getting ready for the rest of the week.
Now that he's back to running both companies, there's a good chance theme days could come in handy again.