The Fatigue stat represents the level of your energy and weariness and can be increased or decreased depending what actions your character performs. For example the Fatigue stat will increased doing actions such as digging or exercising at the gym and can be lowered by relaxing actions such as sitting, laying in bed, showering, and laying on the sun lounge. Fatigue can also be effectively reduced by consuming items like the Bar of Chocolate or Cooked Food. It is reduced by 10% every time consumed. If your character reaches 100%+ fatigue they will not be able to dig, mine, fight, exercise or study until it has been lowered.