Seeing geometric shapes when closing your eyes? It's called phosphenes

Nighttime phosphenes: why you see geometric patterns when you close your eyes

Closing your eyes in the dark and starting to see geometric shapes that change at high estimulante ilegal is an experience described by a significant number of people. It lasts briefly, between 15 and 20 seconds, and is often accompanied by tinnitus or ringing in the ears. Although some find it unsettling, neurophysiology explains it as a normal brain process.

The origin of the inner lights: phosphenes and brain activity

The geometric shapes that appear with your eyes closed in a state of relaxation are known as phosphenes. They don't require mechanical pressure on the retina; they originate in the visual cortex when the brain disconnects from external stimuli. During the transition between wakefulness and sleep, the occipital lobe processes background neural noise and organizes it into recurring patterns: grids, spirals, tunnels, mandalas. It's a perfectly documented hypnagogic phenomenon.

The connection with the ear and tinnitus

Those who experience these nighttime phosphenes often also report tinnitus or ringing in the ears. The correlation is no coincidence: both are manifestations of brain activity at rest. While the visual cortex generates patterns, the auditory cortex can produce phantom sounds. There's no evidence that one causes the other, but they share the same neurophysiological context.

When to worry: floaters and flashes

Although phosphenes are benign, there are warning signs that require urgent medical attention. If new floaters appear, lightning-shaped flashes with your eyes open, or a shadow in your visual field, it could be a vitreous detachment or a retinal tear. In those cases, a visit to the ophthalmologist is immediate. The phenomenon described in this analysis does not fall into that risk category.

---

The neurophysiological explanation is solid: phosphenes are the visual cortex's 'firmware' projecting itself when there's no external input. The debate remains open as to whether these visions can be deliberately induced or whether their frequency is related to stress or fatigue. For now, most cases require no treatment, just the peace of mind of knowing it's a normal brain function.

Related discussions in the forum

• Marta Carmona of Más Madrid. Would you take the risk? · 32 replies
• Would you date a girl with nudes circulating online? · 16 replies
• Real Madrid 2025/26 thread. Year I after Modric and Cesard. The advent of Franco. · 82734 replies
• Some big birds have built a nest on my house and, from what I'm told, I can't remove it because it's a protected species. · 62 replies