What is the origin of the idiom "wake up and smell the coffee" and when to use it?

The idiom "wake up and smell the coffee" likely originated as a way to encourage someone to become more aware, alert, or realistic about a situation. Coffee is known for its strong and distinct aroma, and the act of smelling it can jolt someone awake or make them more alert, both physically and mentally. By extension, the phrase urges someone to become more aware of their surroundings, the truth of a situation, or the need to take action. It is often used to refer to the person has been inattentive, complacent, or overly optimistic for an extended period of time.