Although this rhythm was initially believed to be in entrained to moon cycles, it is now believed to be more affected by sexual urges.
Breathing through the right nostril stimulates the left brain and is like stepping on the gas pedal. Need an energy boost or some extra focus? Try breathing through just your right nostril for a few moments.
Breathing through the left nostril stimulates the right brain and is like putting on the brakes. Need to relax and unwind? Try breathing through just your left nostril for a few moments.