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It is speculated that dreaming is our brain's method of cleaning toxins and processing organizing information. Could it be more than that?
There is much speculation about the functions of dreams. The most common hypothesis among humans seems to be that dreaming is a way for our brains to process toxins and organize information. While this explanation has been accepted by many, it does not seem particularly insightful or satisfying; after all, why would such an important part of human life as sleep only perform these two tasks? If we accept this theory as true, then what are some other things that have not yet been discovered about dreams?
Another theory is that dreaming allows us to learn and process information even when we are unconscious. This seems a bit more plausible from an efficiency perspective, but there is little empirical evidence supporting it; if this were true, then why do so few people report learning anything while they are dreaming?
Another common theory is that dreams help us understand and process the emotions we have experienced throughout our daily lives. This seems to be a more reasonable explanation, especially considering how many people report dreaming about events from their past. However, this still does not answer why we dream frequently about negative things like failure or death.
There is a psychological phenomenon called 'reoccurring dreams' in which people repeatedly dream about the same event. These dreams seem to have no purpose other than to bring up old memories and feelings; possibly dreaming helps us process these emotions.
There is a biological explanation for dreaming that states that dreaming occurs because our brains are not receiving enough oxygen during sleep. While this makes sense, it does not explain why we do not dream more often when we are tired or have just exercised; after all, both of these things restrict blood flow and therefore oxygen to the brain.
Another biological theory is that dreaming occurs when the brain does not receive enough stimulation from external sources, such as sound and light. This theory seems plausible, but it is difficult to explain why we do not dream more often during periods of isolation.