What is circular breathing and do I need to learn it to see benefits?

Circular breathing is considered an intermediate to advanced wind instrument technique and is NOT required to get the results offered by playing didgeridoo for sleep apnea and snoring therapy. This wind instrument technique allows the player to make a continuous sound, even while inhaling. For didgeridoo this is cited as one of the key elements because it is very characteristic throughout all traditional didgeridoo playing. For sleep apnea and snoring therapy, circular breathing is not necessary, however, it will enhance the practice and it will increase the therapeutic value.