Picture yourself on a Sunday evening, full of determination: "Starting tomorrow, I'll exercise every morning." Monday arrives, the alarm rings, and the warm bed suddenly feels far more important than that distant fitness goal. You hit snooze. The gap between what you plan to do and what you actually do when the moment comes is the heart of time inconsistency. In this chapter, we'll look at why our preferences flip over time, how this leads to procrastination and other puzzling behaviors, and what the inner battle between our patient and impatient sides looks like.