Crying, especially hard crying like sobbing, causes us to hyperventilate. Emotional responses put our body in fight or flight typically, which causes a release of adrenaline. You’re not getting enough oxygen during the sob session, so once the intensity of it dies down for a second, your body forces you to take a deep breath.
It’s also why you usually feel tired and exhausted after a hard cry. Your body got flooded with adrenaline and then it all subsides, leaving you drained.
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