The sleep study will require an overnight stay in a sleep lab. I had it done 10 years ago so things may be a little different. It was done at Johns Hopkins in Baltimore and was the worst night's sleep I think I have ever had. I am thankful now that I did it because the apenea that I have is pretty bad. I have been using the mask for about 5 years (I was resistant the first 5 years). As for the part about being resubmitted to Aetna I do not know. The whole Aetna/lap band thing is new to me.