Daggerfall: User Interface
The red bar represents Fatigue

Fatigue is a measure of how refreshed and alert you are, represented by the red status bar. Almost any action you take causes the bar to drop. If it reaches zero, you collapse from exhaustion and awaken one hour later, slightly refreshed. However, if this happens when enemies are around, they will kill you before you wake up.

Your maximum fatigue is equal to the sum of your Strength and Endurance attributes.

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