Fatigue

Fatigue refers to a system in both RSC Preservation and RSC Cabbage.

RSC Preservation

See the full page on the official RSC wiki: Fatigue

RSC Cabbage

While Cabbage does not use fatigue, the sleep system (through beds or sleeping bags) exists. It acts as a toggle on/off for exp gains. The status (exp gain on / off) is shown on the stats interface in-game.