you know, offthegrid, if you couldn't really sleep during your sleep study, then that would make the results of the test suspect. I had trouble falling asleep during the sleep study because I had decided that not having coffee the day before would make it easier to fall asleep. WRONG! I had withdrawl symptoms--head and body ache that kept me awake. My doctor threw the results away and sent me home with a diagnostic cpap machine which I wore to sleep for the next week or two. Not only did it provide sweet, sweet relief for the problem, but it could measure how many times my breathing was obstructed during the night (something like 80 times a minute!) and provided a comparison of how long I was able to sleep with c-pap against the sleep journal I had been keeping. It was hell, though, when I had to take that machine back and then endure two weeks without it while waiting for the results to be analysed and various appointments to be made