THE DAY OF LOGIC
Theme days are days where there is one theme you focus on for the day.
It is practice for the brain, guaranteed to improve your life.
You might even find that using the logical brain produces better results than letting the avoidance of discomfort rule the day, letting emotions run things.
This might be similar to the idea of taking on the persona of "higher self" for a day, but it is different and it is clearer that it is logic that will govern each piece of the day.