Idk about you guys, but according to my college roommate I sleep talk.
No, not your simple “mumble mumble hi mumble mumble.” I have full on conversations with her.
An example:
“My vote didn’t count…”
“What?”
“My vote… it didn’t count. starts to ramble about the voting system”
“Go back to sleep…”
“Okay…”
My question: Does anyone else ever sleep talk? How severe is it?
I don’t sleep talk, but sleep abnormalities apparently run in my family. I use to cry in my sleep, to the point my parents would have to wake me because I was shouting out. One of my cousin’s constantly laughs in his sleep, as if he was really in a conversation. When he giggles it sounds like he’s faking sleep, but he really is dead to the world. My other cousin does talk but only when drunk, I have yet to catch her talking when sober 
From my parents and holidays with friends I know that I sleep talk. Especially during these holidays I didn’t want to sleep talk and I always woke up the moment I started to talk. Sometimes friends still say that I sleep talk, but it’s more like murmuring. A friend though told me that she already have had a few conversations while sleeping, with her mother for example.
Well, I never had any full conversations, but I do remember once, or maybe a few times (I’m really not sure) where I might have gotten woken, and mumbled something random that at the time, I thought made sense and that other people needed to hear. But then realized “what the heck did I just say?” Fortunately, when I’m first woken up, anything I say tends to be a mumble, so no one really recognized that I was just talking nonsense.
My boyfriend talks a lot in his sleep. I don’t wake up during the night so much anymore, so I don’t hear it that often now, but he does answer me when I reply to his nonsense. His mother tongue is Dutch, so his dream talking is in Dutch too, but he replies to both Dutch or English (I do speak decent Dutch, but our main communication language is English). The sentences don’t usually make any sense, and if I tell him to go back to sleep, he simply obeys. He’s very amused by the fact he talks in his sleep, and insists on me recording it for him to hear - I just never have a recording device handy. 
According to my parents, I used to sleep talk a lot when I was younger. One of my more famous lines was “Oh, how this life is salty and sweet” (around the age of 6). Nowadays I just shout if I’m having a nightmare - only in real life it isn’t shouting, it’s very muffled. I always wake up to it.
My nephew does a lot in his sleep, ive herd him laughing, crying, and fart a couple times lol
This made me think of when my parents told me that me and my brother was talking to each other while both asleep but my brother often sleep talk and sleep walks. Last year when we was on vacation my brother went out of the hotel room and closed the door. He woke up and was banging on the door but I couldn’t hear him. So he went to my parents room and they opened and he slept there. xD
Well, I don’t know what you can do 
I woke up to my ex talking one night.
“I understand everything now…”
“Understand what?”
“The system in the caves…”
“What caves?”
“With channels and (mumbling)”
“What are you talking about?”
“You don’t understand.”
“Please, explain”
“Nah, just forget it. You don’t understand.”
I used to sometimes when I was younger. Now I just sleepwalk.
Here is a guy who talks in his sleep every night! sleeptalkinman.blogspot.no/