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When working an occasional night shift, people often feel groggiest in the middle of the night but experience new energy around the time they normally would wake up. This best illustrates the impact of
a) sleep apnea.
b) memory consolidation.
c) the circadian rhythm.
d) REM rebound.

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The correct answer is letter C

We can define the heart rate as the succession of the heartbeat. On the electrocardiogram is the succession of the QRS complexes over time. The heart rate is generally regular and the heart rate is within normal limits (60 bpm and 100 bpm).