I'm not sure if someone mentioned this already, but there actually needs to be rules for eating and sleeping this addition. We know most races need 8 hours sleep, but we don't know what happens if they don't, or get part of a nights sleep or oversleep. And what the difference between a night in a bed roll and a night in an inn or a night on the ground? Also, what happens when characters don't eat, or how much they need to eat, or overeat. Nothing fancy for this, just a simple set of rules.