What are the shadow figures in lucid dreams? I'd like to hear of peoples experiences?

I have been researching wake induced lucid dreaming, and I came across an interesting but very disturbing phenomenon - shadow figures/people. People who see these entities normally seem to see them whilst experiencing sleep paralysis, and they are apparently terrifying. I am very interested in these entities and... show more I have been researching wake induced lucid dreaming, and I came across an interesting but very disturbing phenomenon - shadow figures/people. People who see these entities normally seem to see them whilst experiencing sleep paralysis, and they are apparently terrifying. I am very interested in these entities and would like to hear about possible explanations for them and about peoples experiences with them. Bear in mind with explanations I am not religious at all but very open minded. Could they be entities in another dimension, or just mind games? Thanks :)
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