Training and running build up fatigue from 0 to 100. High fatigue makes everything cost more stamina and eventually stops you training, and the main way to clear it is to sleep in a bed or a sleeping bag.
What builds fatigue
Training reps (a Push Up adds about 0.03).
Running (0.01 a second) and jogging (0.003 a second).
Using skills (0.3 each).
High Stamina and Durability cut fatigue gain, up to 35% less at 1500.
Effects
FatigueEffect
AnyStamina costs rise, up to x1.3 at 100 fatigue
85+No training until you rest
85+Your screen dims
Ways to recover
Bed
0.5 / s
Use the Sleep prompt. One sleeper per bed.
Gang bases can build a Bedroom with beds.
Sleeping Bag
0.375 / s
Hold it and click anywhere on the ground.
Sleeps at 75% of a bed's rate. Never used up. Costs 600 Won.
Massage
-35
From the nurse at the infirmary for 250 Won.
Offline
0.2 / min
Fatigue slowly drops while you're logged off.
Sleeping rules
You can't fall asleep in combat, knocked or ragdolled.
While asleep every hit is turned away: you take no damage, and nobody can grab or carry you.
Light sleep (the first 8 s): 3 hits wake you up.
Deep sleep: hits can't wake you.
You wake with a move key, the bed prompt again, or when fatigue reaches 0.
Trivia
Only real sleep counts: standing still does nothing for fatigue.