Just recently, I've noticed that Trink does some violent twitchy jerky movements of her legs when she's lying down resting. I'm thinking that it's just that "running in their sleep" thing that dogs do, but her eyes aren't closed when she does it. They are sort of slitted, with part of the white visible. Saying her name makes the twitching stop, and the eyes will generally close fully after that. So, is this just the doggy version of REM sleep? It's jerkier than what I've seen in other dogs, but she is also much larger than most of the dogs I've known before, so it just may be more noticeable with her.
And soon I will stop asking all these questions! It's just that when I think that I've got her all figured out, a new facet of her personality is revealed with new traits.