This image demonstrates a 30-second recording (Compumedics) of stage R sleep. Most notable is the absence of rapid eye movements noted in the eye leads (labeled E2-M2 and E1-M2) or phasic EMG activity. 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.
