I sleep on my back. About the only way my body will let me sleep.

Do you mean the cannula from you air hose, from your concentrator?

I sleep with it I am on oxygen at night, as well as ambulatory. But I do not use an CPAP machine. So I would assume it would help till you get the CPAP. But it will not force the oxygen in, so you have to make sure to breathe through your nose.
Hope that answers the question. Breathe Ez..........