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Do you have a slow ramp up of pressure? I have to start on low pressure when I first put the mask on each evening.

Your sleep doc/clinic may be able to help.

The 'ramp' setting made me panic and felt like a couldn't breathe. We go from zero to full force now, and it works just fine. I use a nose adapter.

That's what I found too (minus the nose part).

It's low pressures that feel suffocating (because there isn't sufficient airflow). High pressure feels great... as a life long asthmatic it's the best I ever breathe.

As an alternative, the opposite may also be true. I could never sleep when I had the slow ramp of pressure.

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