Talking while sleeping is very normal thing, I personally do a lot. My girlfriend says that she often talk to me (whenever she gets bored in night) after my sleep.
And here is an similar story of a husband who talks to his wife daily in sleep.
Wife recently released everything, what he has been talking to her for last 13 years:
Have a read:
#1 Being Belgian
#2 Guy’s Stuff
#3 Smash Time
#4 Hang Out with Napoleon
#5 What to do with Cats
#6 Who is Cooper
#7 Too many bugs
#8 Back in Time