I had that test. They put electrodes on my head and I was wired up to a bunch of equipment. Everything considered I slept rather well.

Then I had is again, but this time they just hooked a thing to my finger (index) and let it record my blood oxygen levels. Didn't even have to go to the hospital for that one. At least, not until I rolled over and clobbered my wife with the recorder -- THEN I had to go to the hospital, but they stitched me right up.

Neither time did the instruments say I had the Apnea.