My thoughts? I don't believe this story for one minute.
Unniversity of Pennsylvania medical center is a learning institution
like many other others around the country.
Anyone who has ever gone to one of these schools for any medical treatment knows it takes much longer than the private sector for the same procedure.
Being a learning institution they would have told you of such and what kind of care you could expect to receive. There is a huge liability against the University if they don't follow like procedures. That includes taking an extensive medical history and exam before you ever get in the lab. Part of that history is "screening" if you have the symptoms of OSA which if present results in the Sleep Study. They just don't give those because you want one or without any of the common findings associated with OSA such as snoring, headaches, night sweats, partner observations, hypertension etc., etc.
Your diagnosis and treatment is then processed step-by-step with a Professor/Doctor having to sign off with each one. Where you may only need 2 visits in the Private sector, you may need 10 going to a learning institution.
Even if you got a Student doctor who didn't know what they were doing, their Professor would have to observe the results and sign off on every step of the way or they simply don't get a grade.
While we can all have good nights and bad nights and a stay at the sleep lab is only 1 night snapshot of your sleep. Depending on allergies and other factors you can easily go one night not having any OSA. But I'd avoid drinking a beer because you can easily end up severe the next night.
The only thing I see being a scam here is maybe your report. All my experience going to UCLA, UCSF, Standford was I got superior service by the best Doctors in the nation, far from being inadequate.
Sorry, but I'm not swallowing this one. if you think it is a scam, black out your personal information and post your PSG results and let us see it, it will show who is scamming who.
someday science will catch up to what I'm saying...