And that's exactly what's described at the end of the article: > If dreams are visual hallucinations triggered by a lack of visual input, we might expect to fi

And that's exactly what's described at the end of the article: > If dreams are visual hallucinations triggered by a lack of visual input, we might expect to find similar visual hallucinations in people who are slowly deprived of visual input while awake. In fact, this is precisely what happens in people with eye degeneration, patients confined to a tank-respirator, and prisoners in solitary confinement. In all of these cases, people see things that are not there.