During which of the following sleep stages shows sleep spindles in ECG?: (A) Stage 1, (B) Stage 2, (C) Stage 3, (D) Stage 4
Answer is B. Ans. B. Stage 2Stage 1 (sleep)presence of theta waves 4-HzStage 2 (sleep)Sleep spindles appears as sinusoidal waves occurring at a frequency of 12-14 Hz. Presence of sleep spindles and K complexes. K complexes are occasional high voltage biphasic waves.stage 3A high-amplitude delta rhythm (0.5-4 Hz) are seen.Stage 4presence of slow waves.