In my city, protective units (footmen, knights, archers, and clerics) will not stop patrolling to take care of basic needs, like eating and sleeping. So they will often pass out from exhaustion, and a few have almost starved to death. This is likely caused by the various stockpiles and crops (“valuable assets”) demanding their attention. I can’t even direct them to the food stockpiles, they just go back to patrolling.
I’m not a tyrannical slave driver, regardless of what my worker units say. Sleeping and eating should always be a higher priority in the AI behavior list.