How to stop talking in your sleep

http://www.healthywomen.org/content/article/how-stop-talking-your-sleep
Top hit on google, but other than the usual sleep hygine suggestions (consistent bedtime, no alcohol before bed...) there is literally nothing else here.

MOST HELPFUL LINK https://www.livestrong.com/article/124982-remedies-sleep-talking/
After the requisite sleep hygine tips, there is some actually helpful information here including naming a few possible underlying medical conditions to rule out and also some info about medicinal treatment.

https://www.webmd.com/sleep-disorders/talking-in-your-sleep#1
Of course WEBMD brings a thorough discussion.
RBD = REM behavior disorder. Related: night terrors. Cause people to yell, scream, grunt.
"Sleep talking rarely requires treatment. However, severe sleep talking may be the result of another more serious sleep disorder or medical condition, which can be treated. Talk to your doctor about your treatment options."
Doctor may suggest a sleep study.
In addition to other sleep hygine habits, also suggests keeping a sleep diary including daily meds, foods, drinks, exercise.

https://www.huffingtonpost.com/2012/01/10/sleep-talking-tips_n_1197493.html
Again the usual sleep hygine sugestions.

https://sleepfoundation.org/sleep-disorders-problems/sleep-talking/treatment
Sleep hygine again. And your roommate/partner should wear ear plugs. [seriously?!]