Hi Sja.
All of these symptoms are trance symptoms, and the visuals are known as hypnagogic imagery. This is normal for a deep trance or what sometimes happens when it takes a long time to go to sleep- the dreaming part of the brain produces images (and sounds too, sometimes even tactile symptoms) while you're still conscious.
The converse of this happens when someone wakes up while still paralyzed, then they're called hypnopomps.
All very normal, usually not noticed when one goes to sleep relatively fast.