This issue only occurs when i go into a deep meditation specific to relaxing my muscles before sleep. I had to learn this as a kid because my mind would race for hours trying to fall asleep. With a few different techniques, I can fall asleep within 15 minutes. 5 if I'm already tired. But it wasn't until recently that i discovered i could push the technique far enough to relax my autonomous breathing. But probably very much related to sleep apnea, just not quite the same in my case.