Sleep apnea tests are done in a sleep disorder center. The most common test is a sleep study, or polysomnogram. The technicians will observe you while you sleep and monitor physical activities such as brain activity and heart rhythm. If it is suspected that you have sleep apnea, you may be asked to come in for more observations. Other tests for sleep apnea include EEG, EMG, EOG, ECG, snore microphone, and nasal airflow sensor. Follow the links below to find WebMD's comprehensive coverage about how sleep apnea is diagnosed, what tests are used, what to expect from test results, and much more.