Very interesting. I do think there is often a genetic and/or neurological component to stuttering, although maybe not in all cases, but trauma was certainly what triggered my own, and the neuroplasticity of the brain means new pathways can be built to overcome these issues. Dealing with my trauma definitely led to improvements in speech, although I didn't do EMDR. Because of this, I always consider the psychological aspects of stuttering, and what can be done in that regard to improve things. Speech therapy that focuses on the mechanics of speech just didn't cut it for me. I definitely agree that getting adequate sleep can help you process all that needs to be processed, and like you say, is when much neuroplasticity comes into play. I hadn't thought much about not talking to myself when alone, but I do vaguely remember spending a fair amount of time alone, silent, when I was dealing with my trauma. It kind of makes sense, though: talk only when you need to talk. Although for a time I did enjoy saying tongue-twisters just to exercise atrophied speech muscles. The breath thing is good as well. I used to try to speak with no breath when I was a lot younger. Singing is good practice for this as well. I'm glad you found an approach that works for you and hope you enjoy continued success!