This is part four in a six-part series on the evolution of the sleep technologist. AAST has engaged professionals from across allied healthcare to address, from their perspective, the value of collaborating closer with sleep technologists and/or incorporating the discipline into their area of health. Orofacial myology is the study and understanding of the normal and abnormal patterns surrounding the development of the muscles of the face and mouth, and in turn, how they affect speech, swallowing, dentition and sleep, among other areas. A myofunctional therapy provider is concerned with the importance of a term coined Oral Rest Posture (ORP). This refers to the proper resting place of the tongue in one’s oral cavity. At rest, the tongue should rest against the upper alveolar ridge, just behind the front teeth. The tongue should rest against the palate, with the sides of the tongue contained by the teeth. This position provides the proper foundation for the growth and development of the entire craniofacial mechanism and guides a persons tooth eruption, craniofacial and airway development.