<prompt> K - complex and sleep spindles are seen in which stage of sleepREMStage 1 NREMStage 2 NREMStage 3 NREM  <response>: Ans. c Stage 2 NREMRef: Ganong, 25th edp.273Stage 2 NREMWaves with frequency 12-14Hz called sleep spindles seenhigh voltage biphasic waves called K complexes also seen 