Not all patients need a sleep study, but we will screen you to ascertain whether you are at high risk for sleep apnea. The sleep study detects a tendency for abnormal cessation of breathing, usually associated with airway obstruction when the muscles relax during sleep. This condition can cause problems and even death. After surgery, you will be sedated and receive narcotics for pain, which also depress the normal breathing drive and reflexes. At that time, airway obstruction becomes even more dangerous, and we need to have a clear picture of what to expect and how to handle it. Undiagnosed and untreated sleep apnea can lead to serious complications in the recovery room.