Yes, I have fears of the dark. I have a night light that I use. However, it casts shadows in places that always look like there is something staring back at me. I just have to meditate, do a body scan, or do reality checking. If I roll over, I have to make sure that my back , all the way to the back of my head, is covered in blankets, somehow that makes me feel safe. When I do the nightly turning off of lights and locking doors before bed, I find myself running up the stairs. Something is always chasing me in the dark, I can feel their eyes on me and I feel them wisp the back of my head and neck as I attempt to get away from them.
I contribute it to my imagination mixed with my psychosis. I can honestly say, when I am not in an episode I still have those thoughts. But. they are less extreme. I can walk slower, challenge my self to turn around and prove to myself there is nothing there. It still scares the hell out of me. So, I think psychosis could play a part or make the normal fear of the dark worse and visa versa.