Fatigue is an attribute added in Survival Mode. High fatigue decreases your total available magicka, represented by a dark region inside the magicka bar. As you become more fatigued, the effectiveness of potions will begin to decline, and your ability to recover magicka and stamina will begin to suffer. You will need to periodically sleep in a bed in order to restore your fatigue. In Survival, the Well Rested bonus is no longer granted automatically after sleeping. If you sleep outside, you will not be able to get a restful night's sleep, waking up Drained at best. If you sleep in a bed indoors, you will receive the Well Rested bonus.
Files indicate fatigue restores at a rate of 120 per hour, however it is unknown whether just waiting qualifies and how sleep location affects it.
Exhaustion may lead to becoming Addled.
While overencumbered, Stamina is drained by 2 points per second, and fatigue accrues at 4 times normal rate.
|160-339||Drained||Total magicka is reduced. Magicka and stamina regenerate 25% slower. Beneficial potions are 20% less effective.|
|340-559||Tired||Total magicka is reduced. Magicka and stamina regenerate 50% slower. Beneficial potions are 40% less effective. You are 10% less resistant to disease.|
|560-799||Weary||Total magicka is reduced. Magicka and stamina regenerate 75% slower. Beneficial potions are 60% less effective. You are 20% less resistant to disease.|
|800+||Debilitated||Total magicka is reduced. Magicka and stamina no longer recover naturally. Beneficial potions are 80% less effective. You are 40% less resistant to disease.|