My partner is a naturally very skinny dude who unknowignly had severe sleep apnea for years without doctors or anyone even considering it. He had to suffer a severe burnout and get fired from a nursing job before it got diagnosed. He had 42 breaks in his breathing every hour on average, so not even 2 minutes of continuos sleep basically ever.
Does he gave a bit of an overbite? I have a small overbite that I think is blocking my airway when I sleep, it's that or either my larger than normal Uvola is causing it.
No overbite but has had pretty severe teeth grinding while sleeping which is related. And all this is related to stress as well. Likely getting a late diagnosis of adhd soon as well.
His doctor explained his tongue relaxes so fully it blocks the airway.