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Electro-oculogram is used in Polysomnography to monitor the activity of the eyes in sleep disorder patients. Electrodes are placed near the eye to monitor any movement of the eyes and as there is a stage of sleep that involves eye movement (Rapid Eye Movement sleep) then this test will indicate when and how often this is taking place. As REM sleep is essential to our sleeping patterns, it is important that this test is carried out if you are suffering from disturbed sleep as lack of REM sleep can cause fatigue and lack of concentration during the day. Conducted with several other tests, it will hopefully establish the root cause of your sleeping disorder and lead to an effective treatment.