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breathing.The subject is usually instructed to breathe deeper and slower at about six breaths per minute.The change that occurs in the heart rate activity is very impressive to most people who experience or view it.This evidence is usually enough to encourage a person to practice diaphragmatic breathing to help calm their nervous system down.When this is combined with positive imagery it is even more powerful.This is another way to promote improved sleep [5,6].
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Harry L Campbell (2016) studied this question.
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