Which of these does a somnologist study?

I have sleep apnoea . I did not have to complete a sleep log . I wore a CPAP Mask and the log was made by a data card . CPAP is Continuous Positive Airway Pressure and is a low level continuous ventilation during sleep.

Player #25874027, I was wired head to foot and hooked up to computer during the sleep period overnight. I had positive results no need to see another specialist.! ! !