I was diagnosed at first w/ severe obstructive (SO) sleep apnea following a sleep study in the Winter of 2013. Just this past June, after progressing from a straight CPAP to a BiPAP--and failing to qualify on either machine for insurance purposes--a further sleep study revealed the presence of central apnea in addition to the SO type. Undaunted, I was set up with an APAP machine---it's working really well in the early going. I have confidence that I will make it the 90 days that are required for me to receive the machine free and clear at no cost to me (I have state insurance who is paying for my rental of the device) and it is at that point that I can really tackle my apneas!