Nothing has helped my sleep more than using 3M medical tape to tape my mouth shut during sleep. So I'm forced to breath through my noise when I sleep. (Or I wake up and remove the tape if I'm stuffed up.)
I had sleep issues all my life. My dentist said it looked like I had sleep issues (one side of my teether pushed on more than the others) and a surgeon recommended increasing the size of my nasal cavity. But I didn't want surgery. When the book "Breath: The New Science of a Lost Art" by James Nestor I saw several unrelated people report success with this. It's completely changed my life and I wish I had started this long ago.
(Obviously not medical advice, I'm not a doctor at all, do your own research etc.)
I had sleep issues all my life. My dentist said it looked like I had sleep issues (one side of my teether pushed on more than the others) and a surgeon recommended increasing the size of my nasal cavity. But I didn't want surgery. When the book "Breath: The New Science of a Lost Art" by James Nestor I saw several unrelated people report success with this. It's completely changed my life and I wish I had started this long ago.
(Obviously not medical advice, I'm not a doctor at all, do your own research etc.)