A character may stay awake for up to 24 hours without effect. Thereafter, he becomes fatiguedA fatigued character may not Run, and his Strength and Dexterity scores are each reduced by 2. While fatigued, a character gains a +6 bonus with any save made to resist becoming fatigued, but if he is fatigued a second time, he instead becomes exhausted. A character loses this condition when he becomes exhausted, or after 8 hours of inactive rest. and must make a Fortitude save (DC 15 + 1 per previous save) at the start of each 24-hour period without at least 4 hours’ sleep. With failure, the character falls unconsciousAn unconscious character is helpless and may take no actions. A character loses this condition after 2d4 full hours of sleep. for 1d4+4 hours.