Sleep is one of 4 basic needs that are vital for human survival and yet we are only slowly getting to the bottom of its elementary importance. Poor or insufficient sleep can therefore have fatal consequences - at any age. In the first part of the course, we will look at sleep, its importance for us and possible sleep disorders, especially breathing-related sleep disorders. Every doctor or dentist working in the head and neck area plays an essential role in recognizing and correctly assessing sleep disorders. A sleep disorder can also be triggered by ""not paying attention"". The connections between craniofacial and dental anatomy, symptoms and possible sleep disorders are shown and the necessary diagnostic pathways are presented. Parafunctions also play an important role. In addition, this course will show the current but also the cause-related and possible further treatment methods and their necessary follow-up.