What are these, sub dreams?

Um I don't know what to make of these, sometime when I am still awake I get these short dream like things... The first one was a guy walking on a boardwalk and I was staring forward. He stopped in the center of my field of vision, I saw a smile cross his face dramatically. Then he threw a shuriken at me in a flash and it ends. This is not a dream fragment because I am still awake. I feel my body. The other one was of this guy in a cloak with rectangle eyes. Then the eyes turned yellow. So, does anyone have an idea of what this is?

when exactly do you get these?

I know what you mean, I have them sometimes.

if your talking about when your trying to fall asleep but are still awake its called hypnogogia. You are basically half asleep and dreams are starting to form.