A sleep disorders evaluation is a medical assessment. It may begin with an office visit where the patient is interviewed by a sleep disorders specialist, or the primary care physician may simply refer the patient for overnight testing. Because the diagnosis of many sleep disorders requires that the patient sleep overnight in the laboratory, the St. Joseph Hospital Sleep Disorders Center provides sleep rooms that are private and comfortable in a hotel-like setting. Sleep patterns are monitored by applying sensors to the skin's surface which record brain waves, muscle tone, eye movements, heart rate, breathing patterns, and body movements. This monitoring process is painless, and a technologist is available all night to assure the patient's comfort.