My 80 year old husband was talking to others and asking questions while he was sleeping. This went on for about two hours. When I moved his covers to awaken him, he was fine as soon as he went to sleep he started taking again.
I used to talk in my sleep I would think it is nothing to worry about but if this just started and coincides with a medication change or other personality changes it might be worth talking to the doctor about it.
My mom is 89,, she talks in her sleep.. sometimes its funny to hear! When I was growing up one of my cousins used to talk in his sleep.. we would all listen, and try to redirect him to things we wanted to know ( he was older) Its a normal thing, nothing to worry about in my opinion.
I would think it is nothing to worry about but if this just started and coincides with a medication change or other personality changes it might be worth talking to the doctor about it.