You are the third person to recommend the bipap.
My cpap machine was set for the lowest pressure available (4), but that didn't help. I asked my sleep doctor about a bipap machine, but he said that one is for someone who needs more pressure, not less.
When I was first diagnosed with sleep apnea, my breathing would get very shallow, but the biggest issue was my O2 level would drop. A few times it went into the upper 70's. My pulmonologists office gave me a choice, cpap machine or supplimental oxygen at night. He advised the cpap, so thats what I did. Since my second lung surgery I am using supplimental oxygen instead of the cpap machine.
I think I will have to ask him again about the bipap.