Can You Be Guilty While Asleep?

A Sleepwalking Incident That Changed the Law

Kenneth Parks was a young father going through a difficult time. He had recently lost his job, was facing legal trouble, and was under significant stress. At night, he often experienced sleepwalking episodes, waking up confused and disoriented after unknowingly leaving his bed.

One night, Kenneth left his home while asleep and drove to a familiar location. There, he became involved in a serious incident that resulted in harm to members of his family. Immediately afterward, he went to a police station and reported that he believed he had hurt someone, though he had no clear memory of what had happened.

His legal defense centered on somnambulism, a sleep disorder that causes people to perform complex behaviors while in deep sleep, without awareness or memory. The case quickly drew attention from both psychologists and legal experts. Could someone truly carry out such actions while unconscious? And if so, should they be held responsible?

Kenneth's situation raised difficult questions about the nature of consciousness, intent, and accountability. It challenged the legal system to consider how sleep disorders affect behavior and whether traditional definitions of guilt apply when the brain is not fully awake.

Somnambulism

Somnambulism, more commonly known as sleepwalking, is one of the most mysterious and misunderstood sleep disorders. It's not just about wandering around with arms outstretched like in cartoons; it's a neurological phenomenon that blurs the boundaries between sleep and wakefulness.

Sleepwalking typically occurs during the deepest stages of non-REM (NREM) sleep, specifically stages 3 and 4. These are the times when the brain is least responsive to external stimuli, and waking someone from this state can be extremely difficult. Yet, during somnambulism, the body defies this deep sleep by engaging in complex motor behaviors: walking, eating, talking, and in rare cases, even driving or committing acts of violence.

In Kenneth Parks' case, this dissociation was critical. He drove a car, navigated familiar streets, and entered a home, which are all actions that suggest awareness. Neurologically, though, he was in a state of partial consciousness, unable to form intent or recall the event afterward. This is why somnambulism is often described as a "state dissociation," a hybrid of sleep and wakefulness where the body acts without the mind.

Sleepwalking episodes can be triggered or worsened by various factors: stress, sleep deprivation, alcohol, fever, and even certain medications. Some individuals have a genetic predisposition, with family histories of parasomnia increasing the likelihood of occurrence. Episodes can last from a few minutes to over an hour and may happen sporadically or frequently.

A Legal Dilemma

From a legal standpoint, somnambulism presents a unique challenge. If a person commits a crime while sleepwalking, are they responsible?

In criminal law, two elements are required for conviction: actus reus (the act) and mens rea (the intent). Kenneth's actions were undeniable, but did he have intent? In somnambulism, intent is neurologically impossible because, during episodes, the brainstem and cerebellum may be active, but the cerebral cortex, responsible for judgment and memory, is not. This means the person is acting without awareness or intention.

In Kenneth's case, the court accepted his sleepwalking defense and acquitted him, but the decision sparked controversy. Critics argued that Kenneth should have taken precautions, especially given his history of sleepwalking and the stress he was under.

Gradient of Responsibility

Should someone be held accountable for failing to manage a known risk? This question has led legal scholars to propose a new framework, one that moves beyond the binary of sane vs. insane automatism. Instead of asking whether the cause was internal or external, courts are encouraged to ask: "Could the individual, at the time the triggering factors came into play, be reasonably expected to act differently to prevent the outcome?"

This approach introduces a gradient of responsibility:

• no control (e.g., genetic predisposition, unknown drug reaction): The individual may be acquitted but required to seek treatment.
• partial control (e.g., known sensitivity to stress or alcohol): The individual may bear some legal responsibility for failing to take precautions.
• full control (e.g., reckless behavior like sleep deprivation or substance abuse): The individual may be held accountable for creating the conditions that led to the violent episode.

This nuanced view respects the science of sleep disorders while acknowledging the need for public safety and personal accountability. It also helps courts avoid the extremes of either full acquittal or psychiatric confinement, neither of which may be appropriate for someone with a sleep disorder.

Kenneth Parks' case remains a landmark example of how psychology and law must evolve together. It forces us to ask:

• Can someone be guilty if their brain was incapable of forming intent?
• Should we punish people for failing to manage their sleep disorders?
• And how do we distinguish genuine parasomnia from deceit?

These questions are not just legal; they're deeply psychological. They challenge our understanding of free will, responsibility, and the nature of consciousness itself.

Consciousness, Intention, and Accountability

Kenneth Parks' story is more than a courtroom drama; it's a psychological puzzle that forces us to confront the limits of our understanding of consciousness, intention, and accountability. His acquittal raised eyebrows, but it also raised awareness about the complexity of parasomnias and the challenges they pose to legal systems built on the assumption of conscious control.

This case study invites critical thought about how psychology informs justice. Can someone be held responsible for actions committed in a state of unconsciousness? Should prior knowledge of a disorder increase accountability? And how do we protect society while respecting the realities of mental and neurological health?

In the end, Kenneth Parks may have walked free, but his case left a lasting mark on both neuroscience and the law. It reminds us that the mind is not always in control, and that justice, like sleep, is sometimes more complicated than it seems.

References

Popat, S., & Winslade, W. (2015). While you were sleepwalking: Science and neurobiology of sleep disorders & the enigma of legal responsibility of violence during parasomnia. Neuroethics, 8, 203–214. https://doi.org/10.1007/s12152-015-9229-4
This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0).

TED-Ed. (2022, October 25). Gibberish, urine, and utter chaos: What happens when you sleepwalk - Emmanuel During [Video]. YouTube. https://youtu.be/o_JLTmIFq_A?si=seFuqxGYjdbv42-U

Photo Credits

Cliplab on Adobe Stock. "Aged man in pajamas walks on a home in the night."

Pixel-Shot on Adobe Stock. "Female sleepwalker near fridge at night."

fotokitas on Adobe Stock. "Asian man accused."

joyfotoliakid on Adobe Stock. "lawyers legal services Consulting in regard to the various contracts to plan the case in court."