Day, night and the passage of time was a factor; the setting and scenery was different during day and night. The main character had to eat on a regular basis, he would become tired from running and fighting which required rest and sleep.
The narrative's progression was influenced by the cyclical nature of day and night, as well as the setting and surroundings. The protagonist's need for consistent nourishment led to fatigue from exertion, prompting the necessity for relaxation and slumber.