Thats kind of neat. Reoccuring hypnagogic imagery. It could be random, but it would be cooler if it was some old memory that is trying to surface. I'm imaginig some cool Hollywood movie, where the main character keeps getting these visions, and then finds out that they were memories from when she was a small child.

Have you read about Hypnagogic Imagery? We get these brief dreamlets right on the edge of sleep. They are the hallucinations that pull you into unconsciousness.

I have something similar with faces. I will see random strange faces right on the border to sleep. They will morph into different people, all strangers. I can open my eyes, even roll over. Once I see them, they will always be there when I close my eyes, until I fall asleep. I can even exert some control over them, and turn them into familiar people, or even animal faces.