This is such a fascinating comment. I’m 99% confident you discovered that you have a recessed lower jaw in the most roundabout way possible, and may never have connected this last dot in your chain of troubleshooting had I not told you.

I’d urge you to speak with a maxilofacial surgeon, they will confirm it by taking detailed X-rays of your jaw and will be able to identify that your airway is likely impacted by the recession.

Usually the causal chain is such: Recessed jaw due to poor development as a child, likely a pacifier or a stomach sleeper > causes your tongue to not have enough space and puts backward pressure on the airway constricting it > poor sleep.

Usually people with recessed jaws have a variety of other mouth related problems too like mouth breathing, gum recession, abnormal amounts of cavities, bruxism, pain and poor bite. If youre lucky a dentist might have caught some of that and flagged it to you but usually they send you to an ortho who magically discovers that this can all be solved by pulling some teeth as a teenager and giving you braces.

This actually makes the situation much worse and you only find out in your mid to late 20s.