The tests took an hour!!!Initially everthing was normal but as I went on I could not repeat that level. Tech said it was as though I just didn't have the energy (mm I wonder why!). Worst part for me was when they shut off air for three seconds I felt really dizzy. Also when you just have to breathe normally she kept saying DON't hold your breath. Well that was breathing normally for me so I don't know what was happening there. I know sometimes I catch myself holding my breath and have NO IDEA why? I really want to see the results of this. Anyone else had this done? They did this test after saw sleep doc and was for apnea and COPD.