Chief Bromden considers that the society in which he lives is controlled by The Combine, a sort of millionaire white elite that manages the population at will, especially minorities like him, who is Native American. Thus, he thinks that the pills are an element of domination of this group, that through institutions like the mental hospital and people like Nurse Ratched apply these elements of control to dominate those people who do not want to see progress, alienating them from their own wills and thoughts, and turning them into easily controllable entities.
We can infer that in the story it’s around nighttime, as the mother is putting her children to bed, yawning, and setting her alarm clock for the morning. The fore, we can assume that she is tired and about to go to bed.
