Casey, I think your doctor is trying to find out if you have sleep apnea which could be waking you after you fall asleep. And your trouble seems more like having trouble falling asleep. But the sleep studies give you a lot of information about your sleep which is good to have.
I'd like to suggest a stellate ganglion block or blocks. This I have done. It is supposed to reset your autonomic nervous system. It doesn't make your problems disappear, but it makes you feel capable of dealing with them.
https://pmc.ncbi.nlm.nih.gov/articles/PMC10303073/