Abstract
Insomnia is harmful and has negative effects on the human body. Coffee is the most commonly used beverage to invigorate. Measurement of heart rate variability is the most accurate method for quantitative assessment of the sympatho-vagal balance of the autonomic nervous system, which determines adaptive capacity to stress. In our Case Report, after 1 sleepless night, the stress index rises and the sympathetic over parasympathetic prevails.
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