Oh, I hear what everyone says (unless they sleep in a far-off bedroom) because I am a night owl. I'm still up when normal folks are fast asleep and chattering. Once I'm asleep... Well...I've slept through earthquakes, well drilling, alarm clocks right by my ear (for two [2!] hours), and phone conversations where I was apparently a participant. I didn't count that as talking in my sleep, because it was different from the way in which "talking in one's sleep" is usually meant. I apparently answered and responded, but did not initiate. It was probably more a case of "talking in my groggy state of half-awakeness which I forgot soon after I rolled over and went back to sleep." My mother once watched me get up, walk across the room, take the wastebasket off the alarm clock, turn off the alarm clock, put the wastebasket back, and go back to bed, all without achieving consciousness. It runs on that side of the family. It practically gallops (to steal a line from Arsenic and Old Lace).