Long-term intermittent exposure to high ambient CO2 causes respiratory disturbances during sleep in submariners. D. Margel, D.P. White, G. Pillar. PMID: 14605040 DOI: 10.1378/chest.124.5.1716. https://www.ncbi.nlm.nih.gov/pubmed/?term=submarines+and+sleep+apnea
There is a growing interest in sleep apnea and submarine life. Just because the VA denies your claim does not make them right. This is just one scientific study that shows a correlate between the two. Buddy statements that you snored or had sleep issues helps too.
Art Breaux