Want to know yourself better, so you can make healthier choices and feel better? That’s essentially what the Quantified Self movement is all about. Quantified Selfers (QSs) use various self-tracking methods to measure different facets of their life, which helps indicate specific habits that make them feel a certain way. They’ll track anything from sleep to food, exercise, heart rate, mood, sex frequency, and bathroom observations. The goal is to better understand behaviors, which can hopefully lead to certain personal changes and in turn better health. While the QS movement has increased in recent years, it’s not all that new, nor is it completely out of the ordinary. Millions of people track things every day: Some of us weigh ourselves at the gym, count calories, and log our sleep. In fact, about 69 percent of Americans track at least one health metric, including weight, sleep, or food intake.1 people use apps such as MyFitnessPal to log food and exercise, FitBit to track steps, and Sleep to track (you guessed it) sleep.