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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