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So if that’s the case, then what do we know? Do dreams serve any definitive function or purpose? If no, then do they have any meaning at all?
The short answer is a little underwhelming. Dreams have no meaning whatsoever, or at least, none that can be widely agreed upon. On the other hand, the long answer is much more interesting.
There are currently four main theories for the purpose of dreams, but none of them have sufficient research to back them up under intense scrutiny. That said, they each make a decent amount of sense, and none of them are completely unfounded.
The first and least radical of which is that dreams do not serve as any kind of evolutionary benefit, and is sometimes referred to as the active unlearning idea. Under this model, dreams are simply a side effect of an unconscious brain state, where the entire body is running on a fraction of the power it usually runs on. During the waking state, the brain must adapt to an ever-changing environment where quick and logical thinking is necessary for survival. However, during sleep, there are no stimuli to respond to except for what comes from within our own bodies, random as they might be, resulting in what we perceive as dreams, or the lack thereof.
The second theory is that dreams are meant to maintain our state of sleep. Sleep is an opportunity for our bodies to heal themselves from the mental and physical wear that we experience during the day, which is extremely valuable. A recent study on rats determined that sleep deprivation actually slowed down the healing process of burns. In this theory, dreams serve as a distraction for the brain, effectively prevent sleep from being interrupted by external stimuli, such as loud noises or bright light.
The third and final theory, known as the cognitive theory for dreams, is that dreams happen so we can learn. NPR recently did a study on how people who play Tetris during the day will often find themselves dreaming about it at night. Then, they applied the same concept to lab rats, which concluded that when the rats were sent through several different mazes in a day, they would end up dreaming about solving new mazes during their REM sleep. In another study at UC Berkeley, researchers found that “During... REM sleep, our stress chemistry shuts down and the brain processes emotional experiences and takes the edge off difficult memories.” This could be the reason why people suffering with PTSD often have recurring nightmares of traumatic events; their brains are trying to solve the events like puzzles, trying over and over to solve them by approaching them from different angles. The idea that dreams are meant to help us learn from different experiences, such as Tetris, mazes, and trauma, goes by both the “Cognitive theory of dreams,” and “Oneiric darwinism,” but can colloquially be referred to as a sort of “Mental housekeeping.”
In my final blog post, I seek to explore the effects of sleep deprivation, and determine exactly how necessary sleep is, if at all, particularly for adolescents like myself who prefer to stay up late when possible, and can run just fine on a few hours of sleep.








