I talk in my sleep too. I don't know if I have done it all my life, but I found out about it when I had roomates in college. It was a huge source of entertainment for my roomies. We called it "sleepy talk". Once I was good and asleep they would talk to me and try to get me to say things. The things that I said were apparently hilarious bc they made absolutely no sense whatsoever. This was a million times worse when I had been drinking. They used to write down things I said so we could remember them and laugh at them later when I was awake. Now my husband gets to listen to me yap away in my sleep. He doesn't try to get me to do it for fun like they did, but when he tries to wake me up from sleeping on the couch so I can go to bed, I will start talking sometimes. I even open my eyes and look awake sometimes. He will swear that I am awake and talking to him but I won't remember it at all.
Sometimes it worries me bc I hope I don't say something that would upset my husband. I mean, what if I was having a dream - that I could not control at all - and I said something that would hurt his feelings, lol. It also worries me for real bc I think I do have sleep issues as I don't fully awaken even when my husband shakes the life out of me. I will kick and scream and tell him to stop, but I am not awake and don't remember it later.