MIT researchers implanted tiny sensors in rats' brains and put them in a T-shaped maze with chocolate at one end. The first time through, the rat sniffed and explored everything. Its brain was highly active. After hundreds of runs, the rat raced through the maze in seconds. Its brain had gone almost completely quiet. The brain had encoded the maze as a chunk: a sequence of actions that ran automatically once triggered. This is how habits work in humans too. Every habit follows the same structure: a cue, a routine, and a reward. The cue is whatever triggers the behaviour, a time of day, a place, an emotion, another behaviour, or a person. The routine is the behaviour itself. The reward is what your brain gets from it, the feeling that tells it this sequence is worth repeating. Over time, as you repeat the loop, the brain stops deliberating and just runs the sequence. That is what makes habits so powerful and so difficult: they operate below conscious decision-making. You are not deciding to do them. You are just doing them.