The all-night sleep study is frequently used by sleep physicians to evaluate adult patients when they are sleeping. This laboratory test is extremely valuable for diagnosing and treating many sleep disorders, movement disorders and breathing disorders. Sleep studies are monitored by a trained sleep lab technician in a specially designed sleep laboratory. Patients arrive to the laboratory between 8:30 pm and 9:30 pm. The sleeping rooms are private rooms, much like a hotel room. The test will be complete the following morning by 6 am. Upon arrival, the technician will explain the procedure and what will happen during the study. Electrodes are applied to the scalp, sides of the head and under the chin, chest and leg. This allows the measurement of brain waves, heart rate, and eye movements. A sensor is placed by the nose and mouth for measurement of airflow. Belts are placed around the rib cage and abdomen for measurement of breathing movements. A clip is placed on a finger for measurement of blood oxygen levels. Patients should experience no pain or discomfort during or after the tests. Sleep studies are generally easy to tolerate, comfortable for patients and give the physician the information he/she needs to accurately diagnose and treat. Patients are carefully monitored throughout the night, with special medical equipment and video cameras. A sleep technician is always close by to answer any questions or provide assistance.