During our nightly sleep, our minds create vivid, often perplexing narratives. Dreams, a universal human experience, occur during rapid eye movement (REM) sleep when brain activity is heightened. Whether scary, insightful, or downright bizarre, the function and science behind dreaming remain widely debated mysteries.
Historically, dreams have been seen as messages from the divine, sources or guidance, or even glimpses into the future. Psychologists like Sigmund Freud and Carl Jung believed they revealed hidden fears, desires, and unconscious conflicts. Culturally, dreams have shaped myths, art, and decision-making, from Indigenous dream rituals to modern storytelling. Whether viewed as mystical visions or mere brain activity, they continue to intrigue and influence human thought.
One leading theory suggests that dreams aid memory consolidation. As we sleep, the brain processes the day’s experiences, potentially transferring them from short-term to long-term memory. Another theory argues that dreams help regulate emotions by simulating challenging situations in a safe environment, allowing us to work through fears and stress. From a neurological perspective, dreams may simply be the brain making sense of random neutral activity as we sleep. The activation-synthesis hypothesis suggests that the cortex in the brain assembles this activity into coherent, if sometimes surreal, narratives.
Physiologically, dreaming is driven by a network of neural structures known as the “dreaming brain”. The pons, located in the brainstem, trigger REM sleep and send signals to other regions.
The amygdala, a centre for processing emotions, is highly active during dreams, which may explain their often intense emotional content. Meanwhile, the prefrontal cortex responsible for logic and decision-making, becomes less active, explaining the illogical nature of many dreams. Recent breakthroughs have shown that two-way communication with dreaming individuals is possible. Studies from Northwestern University, Illinois, and research teams in France, Germany, and the Netherlands have independently demonstrated that people in lucid dreams—where they are aware they are dreaming—can respond to external stimuli, offering new ways to study consciousness.
Not all dreams are pleasant. Nightmares, triggered by stress, trauma, or sleep disorders, can disrupt rest and heighten anxiety. Managing stress, maintaining good sleep hygiene, and practising relaxation techniques can help reduce their frequency. For recurring nightmares, cognitive behavioural therapy (CBT) and imagery rehearsal therapy (IRT) have proven effective.
Despite ongoing research, the purpose of dreams remains uncertain. With advances in neuroscience and sleep studies, we are getting closer to understanding their role in memory, emotion, and brain function.