Parabolan
Bluelighter
In most cases.. shadow people are the result of sleep deprivation
The shadow people is the common name for all the hallucinations when binging on amphetamines (meth is notorious here) or actually being in the state of amphetamine psychosis.
There is always "someone" malicious moving always in the corner of your eye, and you can never catch them because when you look there it's gone. But also, shadows themselves actually start moving, shaking, and taking on shapes if you are awake long enough. It doesn't bother me the least anymore since I dropped acid for the first time because the acid somehow clicked my mind into a state of "self-awareness" that never wore off over the years and since then, no drug could overwhelm or instill fear in me, not even a 9-day-meth binge without sleep or food (only LOTS of ice tea and coca cola). Yes, the shadow people are there but I viewed it like I would view the distortions when tripping... I found it fascinating.
Well, gm777 explained it really nicely too, but the thing is: you can't describe it approprietly to someone who never saw them. Like you can never explain to someone how LSD feels. It`s just so far and away removed from everyday human experience, but just like acid, you will instantly recognize them when they come visiting you - this one I promise.
Can you make friends with the shadow people?
I hate those fuckers when they j walk across the street at night tho while youre driving. Those damn shadows move fast as hell.