Op, depending on severity, you need to inform the police or DVLA . He is an accident waiting to happen
if his reason for not seeing GP is down to driving, you can take that control away from him by reporting. Or threatening to. It’s no different than you knowingly not reporting him driving where drunk or drugged.
i only found out after my ex was on CPAP, that he’d once fallen asleep in a traffic queue and another driver had ordered him to park up and stop driving. He could have killed someone. Most of time I wouldn’t let him drive on his own. In his case he was ok with going to GP, but he had severe and enduring mental health problems and the Gp was saying it was caused by antipsychotics and refused to send him for sleep test. Took 4 years of me pleading for him to have a simple overnight test. He had severe sleep apnea as I had been saying for years
you also need to point out the numerous risks to his health- heart attack, high blood pressure, depression, and in longer term dementia
youhave my utmost sympathy, having a partner falling asleep in every conversation, getting lazier, doing same thing over and over cos they fall asleep wake up and forget what they’ve done, and in worse case watch them at the dining table behave like a tired baby with food dripping form their mouths becuase they fall asleep when eating. My exh once face planted his Sunday lunch I’d taken ages to prepare.
The good news is, that once on CPAP my ex “woke up” and became a different man ! He was back to his old chatty self, and was back driving in no time at all. Yep, it was a short term inconvenience whilst his license was withdrawn temporarily, but very easy to get back becuase he’d volunteered the information and the liscence. My understanding if you don’t volunteer to give it up temporarily as soon as you have referral , dvla are less easily to give it back when asked.