The nasal stent basically helps to splint the soft palate open. Subjects have a baseline (diagnostic) sleep study without wearing the device. Subjects are then fitted with the device and then subjects wear the device for at least 7 nights during their sleep while at home. Subjects then return for a repeat in-laboratory sleep study while wearing the device. The primary outcome is to assess the effectiveness of the device by change in the apnea-hypopnea index (number of sleep-related abnormal breathing events per hour of sleep) while wearing the device compared to baseline.