Fatigue

Fatigue is the term we use to refer to a mix of different adverse effects, comprising normal fatigue caused by exertion, to mental stress, minor but lingering cuts and bruises, lack of nourishment and water, sleep deprivation, illness, and other types of damage that come from less-frequent sources.
Read the Sustenance System article to check how food and water affect fatigue.

Fatigue Levels

As happens with Wounds, there are Fatigue Levels. Each character can endure a number of wound levels equal to their Vigor die, divided by two, before becoming Incapacitated. In the same way as it happens with wounds (see Damage and Wounds). Each character has the same amount of Fatigue Levels as Wound Levels.

Fatigue Causes

Next to each Fatigue Level you mark in your Character Sheet, you must write down its cause. This is done because it would be ridiculous to recover from thirst by sleeping.

Exertion - Great physical duress and exercise.
Bruises - Bumps, scratches and various forms of light damage, not strong enough to cause big wounds
Bleeding out - Losing blood due to wounds and injuries.
Starvation - see Sustenance System.
Thirst - see Sustenance System.
Sleepless - Not sleeping
Cold
Heat
Disease -
Poison -
Rad -
SunRad -
Suffocation
Mental Effect

Fatigue Penalties

To survive in the Afterfall you need to pay attention to your basic needs, like nourishment, hydration, protection form the elements, and sleeping properly. You also need to avoid disease and other subtle threats. You need to do it in order to stay sharp for combat, and strong to endure hardship.
Each Fatigue level you get, comes with a series of collateral effects, such as headache, drowsiness, distraction, nausea and many others that interfere with every action you make.
The Drained level never has a penalty, its modifier is always 0, and the last Fatigue level you can endure before falling Incapacitated has a -4 modifier. For each wound level below that one, the modifier increases by 1, as seen in the table below.

Inc.: Incapacitated

		D4	D6	D8	D10	D12
1	Drained	0	0	0	0	0
2	Weary	-4	-3	-2	-1	0
3	Tired	Inc.	-4	-3	-2	-1
4	Fatigued	-	Inc.	-4	-3	-2
5	Exhausted	-	-	Inc.	-4	-3
6	Lethargic	-	-	-	Inc.	-4
		-	-	-	-	Inc.

Recovery

You recover from Fatigue in different ways, depending on what caused each level of Fatigue.

Exertion - Resting, avoiding exercise for a while.
Bruises - Resting or sleeping. Inc: You recover from Incapacitated in 1D6 hours.
Bleeding out - patch your damn wound.
Starvation - Eat. See Sustenance System.
Thirst - Drink. See Sustenance System.
Sleepless - Sleeping.
Cold - Resting or sleeping in an environment with proper temperature.
Heat - Resting or sleeping in an environment with proper temperature, an enough hydration.
Disease - Mostly time, but depends on the type of disease.
Poison - Mostly time, but depends on the type of disease.
Rad - Resting.
SunRad - Resting in the shade.
Suffocation - Catch a breath.
Mental Effect - Resting.