any one switch from cpap to bipap

i have cpap. 4th mask. i get no presure when i put it on my nose. only when i put it on my mouth. i sleep using my nose to breathe. is this central sa. exrays say my sinus and head are clear. any advice what it could be. anyone made the switch successfully. why did you switch.

First off, exactly which brand and model PAP do you have? Some can be set up to turn on automatically when the mask is applied and you take a breath or that automatic start can be turned off and one would have to push the start button for therapy to begin.

Do you have a lung problem? It may be that your inhalation is not strong enough to use the automatic start feature.

I've been thru a good dozen masks to find two that I like and are comfortable for me w/a minimum amount of leak.

I was started on a straight CPAP and that was much better than sleeping w/no PAP. I have COPD and while CPAP was better than no PAP it still wasn't good enough and I was switched to a bi-level PAP and am doing much better on the bi-level PAP.