Nostrils are rotating rest, that is, bilateral nostrils are alternating work, a nostril at work, another nostril in and out of the gas will be significantly reduced, is a normal physiological phenomenon, which has a very important meaning: 1, to protect the nasal cavity, under normal circumstances, there will be a nasal turbinate congestion, enlargement, the other turbinate relative to congestion to reduce, and so on and so forth, when breathing, there is always a nostril into the air more, one nostril into less. This is to protect the patients themselves. 2, alternate nostrils work in favor of the patient’s sleep, because there are always bilateral nostrils alternate breathing during sleep, so that the patient will not take a position to sleep, and promote the patient to keep turning over during sleep, which helps to improve the quality of sleep, and is also conducive to the recovery of the body.