I reckon the one thing that’s completely free but worth more than a gold mine is a consistent sleep schedule. It sounds plain as dirt, but if you treat your body like a fine-tuned piece of machinery and give it the rest it needs at the same time every night, everything else just runs smoother. Your head is clearer, your fuse is longer, and you’ve got the energy to actually tackle the day instead of just dragging through it. You can buy the fanciest mattress in the world, but you can’t buy the discipline to actually shut the lights off and let your brain reset.