Pranayama breathing works at bringing the bodies internal energies into balance. In a simple way, we could understand this by saying it brings the nervous system into balance.
Some pranayamas are more soothing and calming. In this class, we use the ones that are mostly designed to help soothe an overexerted nervous system - Chandra Bhedana, Sitali (Sitkari), and Ujjayi pranayamas.
Take some time with this ancient art to help yourself back to a positive balance.