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"Hot water activates the parasympathetic nervous system, which promotes relaxation, calmness and the potential for better sleep, which we all need. Matter of fact, I need that right now. It also activates the sympathetic nervous system, which is the fight or flight response, releasing neurochemicals like norepinephrine and dopamine to increase alertness, energy and mood. Hot water opens your pores for deeper cleansing, but can strip away natural oils, leading to dryness with prolonged exposure to it."