PRN (As Needed). Polysomnographic Technologist(PSGT)- PRN, self-scheduled. Position Summary. The Polysomnographic Technician performs comprehensive polysomnographic testing and analysis, and associated interventions under the general oversight of the clinical director (MD, PhD, DO) or designee. Qualifications. High school diploma or equivalent. Successful completion of a polysomnography program, of no less than one-year duration, associated with ...