If you're one of those people who 'doesn't dream,' you probably just forget them. One concept that's generally accepted is that dreaming is a highly emotional process, because the amygdala (an emotional center in your brain) is one of the areas of your brain that's most active during dreams, according to neuroimaging studies. But people without PTSD have nightmares, too, so it can't be said that nightmares always accompany psychological conditions. For example, researchers know that people with post-traumatic stress disorder are likely to have nightmares. While scientists know a great deal about what happens physiologically when people dream, there's still much to be studied about what happens psychologically. 'They appear to assist in memory formation, integration, problem-solving and consolidation of ideas both about ourselves and the world,' he says, adding that neuroscientists have discovered that dreams help with information processing and mood regulation, too.

There are many theories of the function of dreams, Kuras says. Dreams may serve multiple purposes, including memory formation.

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