I noticed in my case its due to stress & trying to prepare myself (as much as possible) for odd/awkward/bad situations that could happen in the future (I've had issues w/ friends having breakdowns & telling me really creepy stuff from their childhoods so some of the stuff I contemplate out loud sounds bad. Also, I noticed I do it more when i need sensory stimulation or deep pressure. I've tried singing along to songs on the radio instead, jumping on my mini trampoline in my room (yes I have actually a mini trampoline, THANK YOU MOMMY
) & giving myself deep pressure by rolling myself over a 14-15 pound medicine ball or laying under a 10-11 pound blanket I got from my stepsis (its my "new" bedding
). Stretching also helps alleviate tension in my case.
_________________
Balance is needed within the universe, can be demonstrated in most/all concepts/things. Black/White, Good/Evil, etc.
All dependent upon your own perspective in your own form of existence, so trust your own gut and live the way YOU want/need to.