LMAO... mine has sounded like a little piggy on occasion in her bed in the middle of the night. The first time I heard it I thought there was a wild animal in her room and went flying in there after hearing it on the monitor. Well it was my own little animal! hahaha
My daughter also hums in her sleep and occasionally will even talk now that she is a little older. The humming I know she does as a comfort thing but the other noises I am sure it is from dreams. Sure would love to know what they are about though!
Hope you are able to get some sleep with your lil ones nighttime noises!
Blessings!