At mementor, an interdisciplinary team from the fields of psychology, medicine and software development works on digital health applications in the field of sleep medicine and related areas. Surveys show that one third of the adult population suffers from sleep problems and 10% meet the diagnostic criteria for a clinical sleep disorder (insomnia). It is estimated that only a fraction of those affected receive professional treatment. We have set ourselves the goal of closing this gap in care. With somnio, we have developed a digital sleep training app that is the first app to be approved on prescription in the field of sleep medicine and can be prescribed by doctors and psychotherapists.