When my hedgehog sleeps on me she sometimes wakes with a grinding teeth sound. It doesn't sound like she's upset and she's completely relaxed. Someone else recently said it sounds like she's chewing on kibbles which is exactly what it sounds like. She's only about two months old so I don't know if she's growing or why she does it. Does anyone know? She only does it when she's on you sleeping and she's completely comfortable with me she doesn't bite me or do anything to hurt me.