Camarath said:I have been trying to find the rules governing a character's need sleep but have not been able to find them. What happens if a non-casting character goes with out sleep for several days? Can anyone help me find the rules that cover this?
I did not see any rules for when a character becomes Fatigued or Exhausted due to lack of sleep there.Lord Thurham said:
Fatigue and Exhaustion
They should be listed in the condition summary section of the DMG.
Sleeping in Armor: A character who sleeps in medium or heavy armor is automatically fatigued the next day. He or she takes a –2 penalty on Strength and Dexterity and can’t charge or run. Sleeping in light armor does not cause fatigue.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.