Explain the logic verbally using economic theory and illustrate with at least one theoretical graph (e.g., a supply-demand graph).

My variables are represented by the independent variable, annual median income, lying on the x-axis and dependent variable, greater or equal to seven hours sleep per twenty-four-hour period will lie on the y-axis. It is theorized as more individuals recieve 7+ hours of sleep per night, the higher income they will recieve. Please help in great detail how I could make this graph with a detailed technical economic statement(s).