You can do home studies too. Insurance might bat it down, but it goes through most. Sleep apnea is one of the really misunderstood maladies ive ever researched. Mainly there are 2 types, then sub types. My first study the tech came in and woke me up after around 2 hours plus. Cleaning the machine, etc, getting things right is important. Anyways, get it done! If you have a neuro link problem or obstructive. Once, you get it dialed in and well treated. Took me 4 years to figure shit out or have the right help. A Phd. Helped me more than many docs. Mine was bad, and i caught it young . Destroys your health. You basically stop breathing what could be many times per minute and or long periods.