I think there are some physical and some psychological aspects. At first the physical things. I tried to have enough sleep, especially if there is a possible long grind deep in the night. I could start only after the evening diner, so if i play a mtt with thousands of people, a deeprun could go until 5 or 6 in the morning. And if im tired at this most important stage of the tourney the bad decisions are increasing very high. And thats costs alot of money and value. Deepruns are very rar, so if you had those games, its so important to play your best game. Also psychological issues are important. if iam tilt, bad decisions are higher.