hmm a squeal? LOL oh man I bet you can't wait to tell her boyfriends how cute she was as a baby and she would make this cute little squeal..
I know both my kids were loud sleepers and it sounds like they are working very hard (which they are) and the ped told us it was perfectly normal (something about how certain parts of the body are big enough yet thus they breath differently until they are) and it disappeared somewhere between 6-12 months.
The squeal could be from a number of things, it could just be a sound generated by her breathing, it could be a specific sound she is making in her sleep (babies cna and do babble and make noises sometimes when they sleep), or it could be something else. It never hurts to mention it to her doc.
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Mommy to Alex (4)and Mason (1 1/2)
Law Student - 1 year done, 2 to go