In all three of the Fable games it is impossible to sit down. But what if the hero gets tired or needs to just get away from killing bandits or monsters all the time? It's exhausting work! In the next Fable game I think that the hero should be able to sit down because in Fable 2 the hero couldt not even sleep sitting or lying down, even with all that furniture. Next time the hero has to sit down or I might have to file a complaint to Lionhead studios! 
