Most people are hallucinating anytime they open their eyes. We have blind spots where the optic nerve goes through the retina. There is no optic information due

Most people are hallucinating anytime they open their eyes. We have blind spots where the optic nerve goes through the retina. There is no optic information due to the lack of rods/cones there, so our brain interpolates that information based on surrounding information. For this reason we don't see an empty spot in our periphery. You might have tested this effect as a kid with a paper with an X/dot on either side. When staring at the X you can see the dot "disappear" if you line things up correctly. A neurologist (and author of Phantoms in the Brain), Dr. V. S. Ramachandran, tried to test the limits of this interpolation with test subjects with larger blindspots. He found that when looking at text, some participants found that the brain would create fake glyphs to fill in the "texture" of the text. I get insomnia often and have found that when I am very sleep deprived those blind spots actually exhibit lag and become more detectable. This is especially noticeable when I turn my head quickly.