Impulsivity is a multidimensional personality trait, which encompasses such tendencies as inability to complete tasks, lack of planning before acting, seeking out new and thrilling sensations and experiences, and risk-taking in response to extreme emotional states. These traits have been theorised to be important in many research domains, and years of research have further validated the importance of this constellation of traits. This book addresses some of the most up-to-date approaches to research with impulsivity and reviews the current state of the research concerning the role of impulsivity-related constructs for a wide range of psychological outcomes, including brain waves, addictive behaviours, neurobiological underpinnings and sleep disturbances.