I talk in my sleep sometimes. the reasons are many - a stressful day, excited about an upcoming event, guilty conscious (usually about not spending enough time with family and friends and partner) talking out loud what Im dreaming, switching into various alters through out the night and talking as an alter, out of fear of something I was dreaming or had gone through recently..

my doctors have never come up with a physical reason, I even went through a sleep study a while back to find out about physical reasons but the tests all varied so much, this night I talked before entering REM, that night I talked after entering REM, this night I hadnt fallen fully asleep yet, that night I had already passed through all the sleep cycles and talked as I was awakening.

the only thing that everyone could agree on was it corresponded with what was going on in my life at the time I was talking in my sleep and that it wasnt harmful for me to do it.

Talk with your treatment people and they can help you discover why you are talking in your sleep.