Have you seen a Shadow in your dreams?

Several years ago I dreamt of a shadow lurking in dark woods nearby.
 
I was outdoors, in the dark, and not alone. Sitting in a clearing and trying to immerse myself in the only light available from the screen of a laptop, my heart racing as it approached.
 
A shadow in the shadows, I couldn’t see it until it was within arms reach, rushing at my with a wicked hostility.

It seized me and my body went into a spasm in my bed. All of my muscles tightened, and when I opened my eyes, the walls were dancing in geometric patterns.
 
I wonder if it was a flood of DMT as my brain believed it was going to die?