I was dreaming this afternoon on my back and had finally gotten my left leg to stop twitching. I had a dream of some "silhouette people" or "shadow people" running off in the distance towards the right. One was clearly female; I couldn't make out the gender of the rest. I decided not to try to interact with them.

Their outline was very sharp; they didn't have any facial features or distinct clothing patterns. They were like black construction paper cutouts, but they were clearly alive, and moving. They didn't cast shadows, from what I can remember.

This isn't the first time I've seen "shadow"-objects. What are these?