Stimulants can induce feelings of energy and self-confidence. Some people begin using stimulants to lose weight, to try to improve in school, or to improve performance in athletic activities. Others may use them if their job requires shift work that can run late into, or through, the night. In none of these cases do people use stimulants to “get high” (although people do this), but it is nonetheless possible that these users develop stimulant-related disorders, particularly if they take the substances regularly. This is why stimulants are controlled substances.