Our Meep also makes noises in his sleep.  He seemed to do it more the first
couple of months we had him.  He would be sound asleep and let out a noise
(good and loud) somewhere between a scream and a moan.  It scared us to
death at first and we would come running but nothing ever came of it that I
could see.
 
Karla
Meep and Daisy
[Posted in FML issue 2328]