CPAP user, sleep study ordered.

About 9 months ago I had an at home sleep study (moderate Sleep Apnea) and have been CPAPing ever since. I managed to get my AHI from 11-15 down to less than 5. Went to see the DOC and said even though I sleep better I still feel like crap. So now I get to go in, have a thousand electrodes attached and am expected to actually sleep in a uncomfortable bed with someone watching me, in a sterile'ish environment. Should be easy???? What could go wrong? That's my question, what could go wrong?