The typical 24-hour sleep-wake cycle disruption, sleep apnea, periodic limb movement disorders, insomnia, etc. are all assessed during this overnight diagnostic sleep study. The study includes a variety of physiological measurements, including oxygen saturations, snoring, respiratory effort and airflow, EEG (brain waves), EKG (heart), and EMG (muscle movement). Every overnight sleep study, both diagnostic and therapeutic, must adhere to these parameters.