Psychology behind nightmares

The scientific community still grapples with the enigmatic origins of dreams . Dreams are often regarded as captivating yet insignificant byproducts of the sleeping mind, with uncertain functional significance. Although individuals experience numerous dreams each night, most are forgotten. However, there are exceptions, with nightmares standing out as particularly vivid and frequently recurring.
 

Nightmares are intense dreams that cause the sleeper to wake up suddenly and remember the details vividly. Luckily, only a small proportion of the population experience nightmares on a weekly basis. Psychologists suggest that nightmares may indicate psychopathological processes, as they are more prevalent among psychiatric populations. Children, who have more rapid eye movement (REM) sleep per night than adults, tend to have more frequent nightmares, while the elderly, who have less REM sleep per night than adults, report nightmares less often. In general, females report experiencing more nightmares than males.

 

According to research,  there are multiple generators in the brain that contribute to the experience of dreaming . While dreams are mostly visual in nature, it was previously believed that higher cortical systems were primarily responsible for generating them. However, individuals who are congenitally blind have reported having visual dreams, indicating that non-cortical structures must also play a role. Animal studies conducted over several decades suggest that bottom-up mechanisms, particularly those that regulate the autonomic nervous system, involving brainstem structures are important for the generation of dreams.
 

Nightmares are commonly associated with post-traumatic stress disorder (PTSD), but they can also occur without any specific traumatic event. Certain conditions such as heavy smoking, type 2 diabetes mellitus, anxiety disorder, and constipation have been linked to an increased frequency of nightmares. Those who experience chronic nightmares often have disrupted sleep, as they wake up frequently throughout the night with periods of intense arousal that activate the sympathetic nervous system and reduce the activity of the parasympathetic nervous system, leading to increased heart rate.

 

Hence, it is crucial to comprehend the reasons behind the increase in nightmares because their frequency has a significant linear association with a higher risk of cognitive decline in middle-aged adults and an elevated risk of dementia in older adults.