This image demonstrates a 30-second recording (Compumedics) of stage R sleep. Most notable is the cluster of rapid eye movements noted in the eye leads (background shading). The top two leads represent the eyes (right and left), the next lead is the chin, then the following six leads are EEG (right and left frontal, central, and occipital), ECG with heart rate below (R-R), and the leg EMG lead.
