I do hate that Op used Lemmitters instead of Lemmings. It sounds bad

Love how OP thinks whatever this is is just normal common knowledge and the rest of us are like…erm…

Not sure if that is what you mean here, but when I was in University I started taking speed to try and keep up with studying despite my ADHD/depression.

And not just a bit either, but quite a lot and I must have overdone it and stayed up too many nights in a row once. I remember trying to go through my day, while I constantly spotted what could only be described as “shadow people”, whenever I tried to directly look at them they would be gone, but then I‘d see it again just near the edges of my field of view. It was one very creepy day and what led to me finally admitting I can‘t do it anymore.

So I ended up dropping out, found a job in IT and got therapy and some more reasonable ADHD meds too. Still, I imagine that is what being schizophrenic might be like and I did not enjoy that at all.

Lots of people suffer from sleep paralysis and/or psychosis.

what in the world is a shadow person?

A few years ago I was driving to my wife’s parents place to let their dogs out. It was about 6pm so not dark yet but, the sun was down. I turned the corner o t a back road that went next to the river and all of a sudden it rather dark outside, and I had a really bad sense of dread like the air was heavy. Some of the worst fear I’ve ever had was setting in. Then suddenly on the right I saw man who was pitch black wearing a hat leaning against a sign. Half a mile later I saw him again sitting on the guardrail on the other side of the road, so I sped up and got out of there. A few hours later I was headed home and same thing happened d I turned on the road and had fear well up inside me. I came around the bend and watched a Jetta go flying off the road and the girl driving hopped out and looked at me with tears pouring down her face, usually I’d be one to stop and make sure all was ok but, with the fear I had I just wanted out of there. Then I came around the next bend and saw him standing in the middle of the other lane roughly where I’d seen him before so I just floored it and got out of there. Still get spooked thinking about it and have a lot of nightmares since where the man with a hat is chasing me while I drive

The story is A Wizard of Earthsea (1968, Ursula K. Le Guin), I read it when I was very young, and shadow person is the plot.

When you say “have a shadow person” are you missing the word “seen” there or do you mean some kind of ownership or possession?

This is a bit confusing. I’m not sure if the shadow you mean is a dark side of our own personalities or if you mean something like an apparition or hallucination. As for the second type, I didn’t know people could actually establish a “relationship” with these, all stories I heard (and experienced) are about a shadow figure that appears and then it’s gone. I’ve never met someone referring to one of these as a normally reoccurring thing. I’ve seen shadow imps when sleep deprived if that counts?