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How are rapid eye movements during REM sleep connected to dreams?
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Rapid eye movement (REM) sleep is a distinct phase of the sleep cycle characterized by vivid, hallucinatory dreams and high levels of brain activity. The connection between REM and dreaming was established in 1953, when researchers discovered that these eye movements often signal that a person is dreaming.123
While dreaming can occur during non-REM sleep, reports of vivid, visual dreams are significantly more frequent when individuals are awakened during REM sleep. The physiological link involves several key processes:23
- Brain Activation: During REM, the brain exhibits electrical patterns similar to those of an alert, waking person. Functional brain imaging has shown that spikelike electrical activity in parts of the brain associated with vision is closely linked to the rapid eye movements themselves.32
- Neural Processes: Researchers suggest that the distributed patterns of brain activation and deactivation during this stage are involved in the production of dreams. For example, the activation of limbic structures may contribute to the high emotional content of dreams, while the deactivation of frontal brain regions may account for their characteristic bizarreness, such as distortions of time and space.2