A sleep study or polysomnogram (PSG) is a test that electronically transmits and records specific physical activities while you sleep. The recordings become data that are analyzed by a qualified sleep specialist to determine whether or not you have a sleep disorder.
Two-night evaluation PSG and CPAP titration: CPAP (continuous positive airway pressure) is a sleep apnea treatment that involves the delivery of air into the airways through a specially designed nasal mask. On the first night, general monitoring and diagnostic evaluation is conducted. The second night evaluation is to make sure there is a good enough reading to determine there is sleep apnea, and what would be the necessary CPAP pressure required to alleviate it.