Stimming, or self-stimulatory behavior can help a person to regulate themselves. It can help them "tune out" other input when they are overstimulated or make them more comfortable by providing extra input if they are understimulated. It can help regulate intense emotions. Some believe that even things like headbanging serve a purpose by releasing endorphins, the chemicals our body produces to help us relieve pain. Learn more about what may be causing stimming and how you can help.