Rhythmic movement disorder is observed using the standard procedure for polysomnography, which includes video recording, EEG during sleep, EMG, and ECG. These aforementioned brain monitoring devices eliminate the possibility of epilepsy as a cause. Other sleep related disorders like sleep apnea are ruled out by examining the patients’ respiratory effort, air flow, and oxygen saturation. RMD patients often show no abnormal activity that is directly the result of the disorder in an MRI scan. RMD episodes are strongly associated with stage 2 NREM sleep and, specifically, K Complexes