Left Nostril Breathing is a calming pranayama meditation to calm the mind and soothe the nervous system. Using the right hand to gently close off the eight nostril, you will breathe through the left nostril only to bring in cooling and calming energy. The left nostril breathing connects to the energy of Chandra / the moon energy. This energy channel relates to the Nadi channel of "Ida" which is guided by the right hemisphere of the brain and left side of the body. It is a cooling and calming breath to soothe the Nervous System. It is a great meditation to do if you are feeling anxious or to calm the mind before bed.