As Livia was sleeping, I sat and watched over her for about 20 minutes. Every once in a while she twitched or shuddered. Livia clenched and unclenched her fist. Her eyelids fluttered open and I saw her eyes sliding around as if unbalanced. She squeaked like a mouse, threw out her arms as if plummeting from a great height, and then fell back into a deep slumber.
What is going on when an infant sleeps?
Was Livia dreaming?
I did some quick research (AKA Googled the subject), and came up with this article, which seems, to this layman, to make the most sense.