Dreaming of a shadow without seeing who made the shadow, is an odd dream. Since we can’t discern who owns the shadow, it appears threatening. This dream could have been triggered by an event during the day. The brain received a stimulus which reminded it of similar situational threats in the past. The brain then creates a dream, to relay the message to the sleeper.
Prompt – shadow from https://fivedotoh.com/2019/08/14/fowc-with-fandango-shadow/ for Aug. 14 2019.