Why do people talk in their sleep?

That’s something I don’t know much about. And I suspect that no one knows a great deal about it. Scientists who study sleep and dreaming think that sleep talking is something separate from dreaming. I have read that it occurs during light sleep but not during the “rapid eye movement” or REM sleep when most dreams occur.

I guess I can’t help you very much except to say that I don’t think sleep talking is anything strange or anything for you to worry about.