K - complex and sleep spindles are seen in which stage of sleep: (A) REM, (B) Stage 1 NREM, (C) Stage 2 NREM, (D) Stage 3 NREM
Answer is C. Ans. (c) Stage 2 NREM(Ref: Ganong, 25th ed/p.273)Stage 2 NREMWaves with frequency 12-14Hz called sleep spindles seenhigh voltage biphasic waves called K complexes also seen