Baby Nera's Odd Attitude (Eating to Sleep)

Every time.. baby Nera is eating, she would eat until she falls asleep. Like literally fall and sleep. I'm not sure whether that is normal or not, but it's starting to worry me because I can see her breathing is different when she falls asleep. Something is off somewhere..

We're discussing the possibilities in the Guinea Pig Cages Forum. Most of them thought it's tthe signs of mites.