The present invention relates to peptides derived from human Basic Proline-rich Lacrimal Protein (BPLP), notably opiorphin, for use as psychostimulants. These peptides are useful in the treatment or prevention of diseases such as obsessive-compulsive disorder (OCD), narcolepsy, hypersomnia, vigilance drop, attention-deficit/hyperactivity disorder (ADHD), attention deficit and/or hyperactivity in adults and in children, depression, bipolar disease, dysthymic disorder and cyclothymic disorder.
