My own sleep issues started years ago when my 2nd child was around 4 months old. I woke to hear an anguished animal cry coming from his room. I rushed in to find him lifeless and already cold. The cry was his death cry.
I picked him up and ran to our room with him and dropped him on the bed. The drop caused his heart to start again. The only sign of life was a slight movement of his left hand. He was breathing but so very cold. I warmed him up in bed with us.
Next day I took him to the doctor. She totally dismissed what I was telling her! She said I shouldn't have picked him up and that he wouldn't have been cold if I had heard him cry a moment before lifting him. I asked for a monitor for him so I could go quickly to him if it happened again. She laughed at me.
So, for the next few nights I set my alarm to wake me every hour so I could check he was OK. After that I didn't need to set it, I woke anyway.
A few months later it happened again. No cry this time but when I checked on him he wasn't breathing. I revived him and all was well, except that my sleep pattern and my hormones were wrecked. It was over 20 years before my sleep pattern recovered.
A year or so after the incidents with my son, my dentist had exactly the same thing happen with her baby. Her doctor listened and gave her a monitor. Like my son, hers had just one more episode a few months after the first.
I don't regret messing up my sleep patterns for my boy but I do get upset when doctors just don't listen to their patients and then blame the patients for something that the doctors could have helped with.