Why Do We Dream?

Dreaming is a normal physiological phenomenon. Scientists do not yet fully understand the mechanisms behind it, but several theories explain why we dream, including memory processing, emotional release, problem-solving, physiological needs, drugs and chemicals, as well as genetics and individual differences. Dreaming is closely related to rapid eye movement (REM) sleep. During REM sleep, the brainstem reticular formation continuously emits electrical signals, and the cerebral cortex attempts to assign meaning to these random signals, forming dream narratives. At this time, the pons-medulla oblongata circuit regulates the initiation of REM sleep, the hypothalamus integrates metabolic and circadian rhythm signals, while higher brain regions such as the prefrontal cortex participate in the fine-tuning of dream content. This neural activity leads to dreams often exhibiting non-linear and weakly logical characteristics.