Dreams are imaginary sequences—some with clear narratives, and some without—that play out in people’s minds as they sleep. Most dreams consist of a series of images, sensations, and emotions ...

Dreams are excursions of our central nervous system, unfolding when the body is at rest, but our brains are in thrall to rapid eye movement (REM) sleep. For people with a rare condition ...

Does this mean that blind people can dream in visual images? In some cases, they can. A 2014 study found that people who were not born blind but had lost their vision later in life sometimes ...