I went to my home town from across the country when my grandmother died, I was sleeping on the couch and my mom woke up early and was reading the newspaper close by and saw I wasn’t breathing much.
She said I should go to the doctor, a month later I had a CPAP and had my first restful sleep of my entire life, somehow I survived having a brain that doesn’t tell my lungs to breathe all the time while asleep.
I was practically a new person, it took some years for my brain to bounce back with regards to memory and clear thinking but I’m as normal as can be now.