Recently, I read an article in the New York Times entitled

Do You Suffer From Decision Fatigue?

which presents neurological work showing contrary effects in people trying to exercise will power:

more activity in the nucleus accumbens, the brain’s reward center, and a corresponding decrease in the amygdala, which ordinarily helps control impulses.

Glucose levels in the different parts of the brain are implicated here.  This is particularly bad for dieters, because

1. In order not to eat, a dieter needs willpower.

2. In order to have willpower, a dieter needs to eat.

However, I’m concerned with things that wear my brain out.  Two of these are:

(1) Trying to tidy things up;

(2) Trying to follow mathematical logic.  Geometrical proofs where I can ‘see’ the result are much more convincing to me than straight logical ones like that usually put forward to prove the irrationality of the square root of two.

What’s your ‘favourite’ area of brain fatigue?