Stamina Points

Stamina points or "SP" are a secondary form of Attribute Point that determine a character's Stamina pool, or how much exertion they can perform before they become exhausted. SP are derived from a mixture of Strength and Constitution. The more a character exerts themselves, the faster their SP goes down. If SP reaches zero, the character will be too exhausted to move.

SP regenerate over time if the character reduces their level of exertion or stops to rest. The amount of SP that regenerates varies according to multiple factors.

Resting to regenerate SP does not seem to affect the general human need for sleep, although as of the end of Mind Games not much is known to the characters about this.