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Why are dreams more vivid and more frequently recalled from REM sleep?

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The increased vividness and frequency of dream recall during REM sleep are closely linked to specific patterns of brain activity. During this stage, the brain exhibits high levels of activation, with firing rates of individual neurons often equaling or surpassing those observed during wakefulness.12

This state is characterized by a unique distribution of neural activity:
* Limbic Activation: The activation of limbic structures is associated with the intense emotional content often found in dreams.1
* Frontal Deactivation: The deactivation of frontal brain regions may account for the "bizarreness" of dreams, including distortions of time and space and a lack of insight or control.1
* Visual Processing: Intermittent electrical activity in parts of the brain involved in vision contributes to the florid, visual nature of these experiences.1

While dreaming can occur in other stages, the high level of cerebral activation during REM sleep makes these experiences more frequent and vivid, leading to higher rates of recall upon awakening.12