<prompt> EEG shows Sleep Spindles in this stage of NREM sleepIIIIIIIV  <response>: B II Stage II of NREM sleep is characterized by sleep spindles on EEC. Sleep spindles are bursts of alpha-like, 10-14Hz., 50 mV waves. When a person falling asleep enters stage I of NREM, the EEG shows low-amplitude, high frequency waves. As the progression from Stage I to Stage IV of NREM occurs, the frequency of waves decreases while the amplitude increases progressively. 