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First, a dream is a form of thinking that occurs when (a) there is a certain, as yet undetermined, minimal level of brain activation, and (b) external stimuli are blocked from entry into the mind, and (c) the system we call the self system (the I, the me) is shut down.
Nightmares are lengthy, elaborate dreams with imagery that evokes fear, anxiety, or sadness. The dreamer may wake up to avoid the perceived danger. Nightmares can be remembered upon awakening and may lead to difficulties returning to sleep or even cause daytime distress. Isolated nightmares are normal, but when dreams that bring extreme terror or anxiety recur often they can become a debilitating sleep disorder.