Eva on Instagram: "Your nostrils (did I pronounce that correctly? ;) switch dominance every few hours - This is called the nasal cycle, and this cycle is connected to different sides of the brain and different nervous-system states. The left nostril is linked to the calming side of the brain and the part of your nervous system that slows your heart rate and lowers stress. The right nostril is linked to the more energizing, alert side. So when you breathe in through the left nostril and out throu

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