In 1987, Kenneth Parks, a 23-year-old resident of Toronto, became the focus of one of the most extraordinary sleepwalking cases ever recorded. Parks, who lived with his wife and infant daughter, was suffering from severe insomnia amid growing financial pressures linked to gambling debts. Despite his imposing physical stature, Parks was known as a gentle and non-violent individual, maintaining close ties with his in-laws.
On the night of May 22, a tragic incident unfolded that would challenge conventional understandings of sleepwalking. Parks reportedly fell asleep on his couch shortly after midnight but subsequently rose and drove approximately 14 miles to his in-laws’ residence—while still asleep. Once there, he broke into the home and, in a violent state, fatally stabbed his mother-in-law. He also attacked his father-in-law, strangling and assaulting him with a cleaver, although the elder man survived.
After the assault, Parks resumed driving but regained full consciousness en route. He then went directly to a police station, where he surrendered, expressing awareness that he had committed a violent act. Parks suffered self-inflicted injuries during the attack, severing his tendons and requiring emergency surgery. He retained only fragmented memories of the event and demonstrated no prior history of violence or motive.
The case initially baffled authorities and experts alike, as it seemed implausible to commit such acts while asleep. However, sleep studies including EEG recordings revealed abnormal brain activity: Parks’ brain was cycling rapidly between deep sleep and wakefulness multiple times per night. This physiological evidence supported the conclusion that Parks was not conscious or in control during the incident.
Sleepwalking, also known as somnambulism, typically occurs during deep non-REM sleep, a stage characterized by reduced activity in the cerebral cortex—the part of the brain responsible for higher-order functions such as reasoning and self-awareness. However, certain brain regions associated with movement, balance, and arousal, including the motor cortex and cerebellum, remain active. This neurobiological state enables complex behaviors like walking or driving, despite the individual being essentially unconscious and unable to form memories of the episode.
Genetic factors appear to play a significant role in predisposition to sleepwalking, with studies indicating that close relatives of individuals who sleepwalk have a markedly increased risk. Stress and emotional trauma have also been identified as important triggers, likely due to their impact on brain regions such as the amygdala, which processes fear and emotional responses.
Interestingly, the brain’s ability to process and resolve emotional difficulties often occurs during the rapid eye movement (REM) stage of sleep, when vivid dreaming typically takes place. This phase aids in emotional regulation by allowing individuals to retain memories while diminishing associated negative feelings.
The Parks case remains a seminal example highlighting the complex interplay between sleep physiology and behavior, and it underscores the importance of understanding sleep disorders within a neurological and psychological framework.