My guess would be the central sleep apnea even though it was only 2 would be a good indicator of cns/dysautonomic. That with the pv. Hypoventilation can also be lower airways due to asthma and lung diseases. Have you looked at congenital central hypoventilation syndrome? This was my d’s cardiologists suggestion to her pulm. He did not think this was the case…more to do with her trach and lung disease. Im not sure which one is right!!! I hate that they all work separately and just kkwwooo they are in the right! Electrolyte imbalance can effect both our girls sleep disorders. Thats what i have been studying lately. We go for her results tomrw. Ill let ya know!