I always felt that study by Gold was messy and had some flaws. It's a decent example, but it nothing I would feel comfortable using to convince a physician that a psych issue could be resolved by treating airway. Better research imo. Guilleminault published some of it where he followed UARS patients who did access treatment and those who didn't, and showed marked detriment in those who did not while they also increased utilization of psychotropics/pscyhatric interventions, while those who received treatment basically resolved most/all 'psych' symptoms'.

For years I was diagnosed with depression and anxiety by medical practitioners. It was incredibly confusing and irritating to be prescribed anti-depressants, and even anti-psychotics, while it was clear as day the drugs did nothing to address my core issues. It was only after several years  that I was able to connect the dots and realize my sleep symptoms, which were related to my jaw problems, were the cause of my mental distress.

Just imagine how many people who are diagnosed with depression and mental illness are dealing with some form of sleep disturbance? I'd be willing to bet 80-90% of them are!

Not to mention most drugs are just a cope for lack of sleep. Meth, coke, and other illegal stimulants literally make you more awake to combat sleepiness. Benzos, alcohol, opiates knock you out to help to go to sleep.

Most people are just sleep deprived.