After a stressful event that raises your cortisol level it takes the body approximately 20 minutes to recover from the event. One way to help your body recover is through proper breathing techniques. Utilizing proper breathing patterns such as extended exhalations is one of the most potent and powerful ways for your body to recalibrate your nervous system.
Other ways Dr. Runyon suggests you try for resetting your parasympathic state is by:
splashing water on your face
rubbing your ears
slow down your eating
take a laugh break.
These techniques also work with children.
Dr. Runyon has amazing tips and techniques in my podcast Helping Families to Ease Stress and Anxiety-Ep 14. Tune in to hear our entire conversation over at Raising Health Human