Picture your brain as a smartphone. You wake up each morning at 100% charge. Every decision you make—from choosing socks to strategic planning—drains the battery. By afternoon, you're running on 20%. By evening, you're in power-saving mode, making the mental equivalent of emergency calls only.
This isn't a perfect metaphor, but it captures something essential: your decision-making ability is a finite resource that depletes with use. Understanding this simple fact changes everything about how you approach daily choices.