@johnbishop I had a Mayo sleep study, nothing like this, but then it was. A Cardiologist had me 'check out' a tiny device that attached to my finger, I was to go back to the hotel room, sleep for the night, and bring the device back in the next day for our consultation. Needless to say, my experience was to lie awake all night and watch my finger, and most likely walk to the bathroom with it. Didnt sleep at all. The consultation said I had sleep apnea, and I argued that's impossible, I didn't sleep! I was awake all night long.