What is the cause of these weird things I do in my sleep?

For years I have slept talked in different languages that do not speak but do know they are legitimate languages and not gibberish. I sit up and stare at my wife and the other night I took my pillow and smothered her. She got me off of her and said what the heck and apparently I just laughed and went back to bed. I do not recall anything that happens through the night though. I m just curious if I should go to a sleep doctor or if anyone had any explanations for these occurrences.

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