According to the activation-synthesis model of dreaming:

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The activation-synthesis model suggests that dreams are meaningful in reflecting how the brain processes information during sleep. The model proposes that the cortex generates randomly activated images, which are then organized into a narrative structure by the brainstem. However, this narrative structure does not necessarily reflect repressed urges or desires, as Freudian theory proposes. Rather, it reflects a process of the brain trying to make sense of the random activity that occurs during sleep.

According to the Activation-Synthesis Model of Dreaming