When your cells are running on fumes and you're dragging yourself through the day, Dr. House is here with some brutal biochemical truth: you're not tired, you're just ATP-depleted. Your mitochondria have declared bankruptcy and filed for Chapter 11. The energy currency of your cells has about as much value as Monopoly money right now. Every biochemistry student knows that ATP is what powers literally everything in your body—muscle contractions, nerve signals, protein synthesis—so when you run out, you're basically a biological paperweight. It's like trying to run a Ferrari on thoughts and prayers. Maybe try eating something or, you know, sleeping for once. Your cellular respiration is basically on life support.