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← Human Body & HealthAn overnight worker consistently experiences poor memory consolidation despite sufficient sleep duration. Which mechanism explains why they still experience this cognitive impairment?
A)Reduced total sleep spindle density
B)Increased stage 1 non-REM proportion
C)Disrupted circadian rhythm entrainment✓
D)Elevated average cortisol secretion
💡 Explanation
Disrupted circadian rhythm entrainment impairs memory consolidation because it disrupts the timing of hormonal regulation critical for optimal sleep architecture and neural synchronization. Therefore, circadian disruption causes memory issues, rather than only cortisol fluctuations or changes in specific sleep stages.
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