To chime in with my personal experience, I'm also able to see this kind of noise/distortion if I relax a bit and stare at something, although I suspect this is mostly a consequence of the rods/cones on the retina getting fatigued.
When I felt sick as a child I would do this with the pattern on our wallpaper to distract myself from the discomfort. Edit: Or to help myself fall asleep by doing something similar with the "noise" you see when closing your eyes.
When I felt sick as a child I would do this with the pattern on our wallpaper to distract myself from the discomfort. Edit: Or to help myself fall asleep by doing something similar with the "noise" you see when closing your eyes.