I'm sure I remember playing an RPG that forced you to eat and sleep (or starve to death/die of exhaustion), but I can't remember what it was, just that it was annoying. Maybe one of the ultima games? Mount and Blade forces you to eat, or at least provide food, but that was part of the tactics neded to manage a large army and fitted neatly ino the game (do I have enough food for my campaign? Do I have enough gold to pay my troops?).
