Talking in your sleep

Zach didn’t sleep quite as well last night as the few previous nights.  In part this was probably because of the excitement of having a buch of friends over to play Rock Band.  We took him into bed with us to help him fall asleep.  He turned on his side, facing me, and after a few minutes, was clearly sound asleep.  And yet, he started talking in his sleep.   It was the first time we’d ever seen him do that.  Though his eyes were closed and his breathing relaxed, he nevertheless spouted out soft phrases like, "Dadadada.  Ahhhhhh."  It was adorable, and funny.  I had to forcibly prevent myself from laughing and waking him up.