I will try to remember the name of the researcher. I believe it began with an 'R,' but I can't rely on my memory anymore...

I found at least 4 different studies that identified sleep disorders after TBI. Some of the conclusions about OSA resulting from TBI are not fully supported by the studies. OSA was discovered in the course of sleep studies in response to complaints about daytime sleepiness and insomnia. They used the vague status of 'no prior sleep disorder' complaints to suggest the OSA did not predate the TBI. Absent the additional insomnia and sleepiness complaints, it leaves the issue of prior OSA as an unknown.

But, sleep apnea, whether OSA or CSA is still worthy of consideration.

I have recommended many times that a bedside or other recording pulse-oximeter system as worthwhile to start the process toward getting a diagnosis, whether positive or negative.

I know he mentioned Johns Hopkins during our discussion, and there is a researcher named Rao at Hopkins who has written some things on TBI and sleep, according to a quick PubMed search. Not sure if this is the guy he was referring to.