Closed-eye hallucinations

How it works

Closed-eye hallucinations are the things you see with your eyes shut. One informal scheme sorts them into five levels, from faint noise to full scenes¹. The first four are described here.

Level 1 is visual noise. The dark grey behind your eyelids, called eigengrau, is covered in a fine moving speckle. It comes from random firing in the retina and the visual system³. Almost everyone can see it when their eyes are shut¹.

Level 2 is light and colour. Slow blobs and clouds of colour drift across the field. Pressing on the eye makes bright flashes and rings called phosphenes. These come from the pressure, so they are not closed-eye hallucinations¹.

Level 3 is patterns and motion. Geometric shapes, tunnels, spirals, and grids appear and move. These are common in the minutes before sleep, when they are called hypnagogic imagery². They are easy to forget, since memory is weak at the edge of sleep².

Level 4 is objects and scenes. Thoughts appear as objects or places¹. At the edge of sleep, whole imagined scenes can appear². This level is linked with psychedelic drugs, meditation, and long visualization training¹. Experienced meditators describe lights and images that come and go during long sits⁴.

None of these are signs of anything wrong. They are the visual system running with no input. In the dark, the brain still has to do something with the wiring, and this is what it does.

How common it is

Level 1 noise is almost universal and needs no special study, since anyone can check it by closing their eyes¹. The later levels are harder to measure, because they depend on tiredness, lighting habits, and how closely a person pays attention to their own vision. Reports of levels 3 and 4 come from psychedelic users, meditators, and sleep research on hypnagogia, not from a single population survey¹².

Try it

1. Lie down in a dark room and close your eyes. Cover them with your hands to block the last light.
2. Look at the darkness without trying to see anything. Notice the fine speckle. That is level 1.
3. Keep watching for a few minutes. Slow patches of colour drift by. That is level 2.
4. Do this when you are tired and about to fall asleep. Geometric patterns and moving shapes appear. That is level 3.
5. Do not press on your eyes to make it stronger. Pressure adds phosphenes, but repeated pressure is not good for the eye.

Is it a problem?

No. Seeing speckle, colour, or fleeting patterns with your eyes shut is not a sign of an eye or brain problem. Mention it to a doctor if you see detailed scenes or hear voices with your eyes open, or if the images are frightening and stop you sleeping, since those patterns fit other conditions better⁶.

History and culture

Many meditation traditions describe visions that appear during practice. Some treat them as milestones, and some treat them as distractions to ignore⁵. One idea is that meditation trains the mind to stay at the edge of sleep, where this imagery appears².