ARB members often have to make many tough decisions in a day. Making decisions is more tiring that people think. I recommend this article from the New York Times. It starts by explaining why a parole board tends to be more lenient early in the day and tougher as the day wears on. ARB members may be subject to the same phenomenon and should guard against it. The article goes on to explain why dieting is so hard (you need food to give you the energy and willpower to resist food).