Teeth chattering question

Hi
I wanted to ask a question. Has anyone ever had their dog's teeth chattering when they are sleeping?

Dogs are much like us, they dream, snore, "run", grit their teeth as if they were eating something, smack their tongue, whimper .. teeth chattering though I don't think I've ever heard? Or maybe I have but just never stopped to identify the sound. I must pay better attention and check my dogs out when they sleep ...!