I have a sibling with bipolar disorder (as I mentioned in the other thread) who participated in a sleep study when he was younger (my great-something-or-another had narcolepsy, so sleep disorder was a valid suspicion). It ended up being a big waste of time for him and my parents because the problem had really mushroomed from a combination of bad habits and the wrong med dosages.
I of course can’t make any definite parallels, but what I can say that instead of running higgeldy-piggeldy to all sorts of specialists that will evaluate your problem through the prism of their area of expertise, talk to the original doctor that diagnosed you, or your family doctor that you rely on and is aware of your complete medical history. They will probably have the best eitzah.