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6 September, 01:18

A person's pulse rate generally goes down while sleeping. One reason for this cause is

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  1. 6 September, 02:56
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    Because the sympathetic nervous system is no longer active following strenuous exercise.
  2. 6 September, 04:11
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    When a person is not being physically active, like during sleep, the heart rate goes down because you're are not doing anything that requires more oxygen.
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