Ashwin Lewis
Sleepwalking murder is a rare occurrence, but it does happen. The idea that acts of violence can be committed by people who are sleepwalking is not new, with the Catholic Church in the 14th century recognising the idea that a sleeper shouldn't be held responsible for killing or injuring someone. The use of the sleepwalking defence in court is uncommon and not always convincing for the jury. However, in some cases, people have been found not guilty of murder due to sleepwalking or non-insane automatism. Sleep forensics is a growing investigative field, and experts are trying to understand the phenomenon of sleep murder.
| Characteristics | Values |
|---|---|
| How common is sleep-related murder? | Rare |
| Can a person commit a murder while asleep? | Yes |
| Can a person have conscious knowledge of their actions while sleepwalking? | No |
| Can a person be convicted of murder if they kill while sleepwalking? | Yes |
| Can sleepwalking be used as a defense in court? | Yes |
| Is it a convincing argument for the jury? | No |
| What are the weapons used in sleepwalking murders? | Guns, knives, hammers, screwdrivers, flower pots, letter openers |
| What are the common patterns in sleepwalking murders? | Female family members are more likely to be victims, no effort to hide the violent act, weapons are usually close to the bed |
| What are the factors that trigger sleepwalking? | Medication, alcohol, drugs, sleeping in an unusual place |
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What You'll Learn
Sleepwalking as a defence
Sleepwalking, or somnambulism, is a sleep disorder characterised by complex behaviours performed during sleep, often without awareness or memory of the events. Sleepwalking as a defence, also known as automatism or the parasomnia defence, is a legal strategy used in criminal cases where the defendant claims to have committed an unlawful act while in a state of unconsciousness due to sleepwalking. This defence argues that the accused lacked the necessary mental state (mens rea) to be held criminally responsible for their actions.
The sleepwalking defence falls under the broader category of automatism defences. When successfully argued, it can lead to acquittal or reduced charges, as the court may determine that the defendant was not in control of their actions and, therefore, cannot be held fully accountable. For example, in the case of Regina v. Parks, Kenneth Parks was acquitted of the murder of his mother-in-law in 1987. Parks had driven 14 miles to his in-laws' home and bludgeoned and stabbed his mother-in-law to death before going to the police station. At the police station, Parks seemed confused and was oblivious to the fact that he had severed the tendons in both his hands during the attack. His obliviousness to pain and family history of parasomnia led experts to testify that he had been sleepwalking during the attack and was therefore not guilty.
To determine the credibility of a sleepwalking defence, several factors need to be considered:
- Evidence of sleepwalking during the crime: This could include witness testimony, surveillance footage, or other circumstantial evidence that supports or contradicts the sleepwalking defence.
- Time between falling asleep and the crime: A longer period of sleep might make a sleepwalking defence more plausible.
- Medical factors: Does the defendant have a history of sleepwalking or other sleep disorders? Medical records can provide valuable evidence to support the defence.
- Trigger factors: Were there any known triggers, such as stress or sleep deprivation, that could have made the defendant more susceptible to sleepwalking?
- Reasonable precautions: Even if a defendant can prove they were sleepwalking, they may still be held liable if they failed to take reasonable precautions to prevent harm. For example, if a defendant with a known predisposition for sleepwalking drives a car despite this knowledge, they may be guilty of criminal negligence.
While the sleepwalking defence has been successfully used in certain cases, it is relatively rare and often met with skepticism. Most attorneys are reluctant to use this strategy as it is difficult to distinguish between a true sleepwalker and an individual who is simply using sleepwalking as an excuse to avoid prosecution. Additionally, courts have different approaches regarding the burden of proof, with some requiring the prosecution to prove that the defendant's criminal act was voluntary, while others place the burden on the defendant to raise sleepwalking as an affirmative defence.
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Sleep forensics
In the case of Kenneth Parks, who was found not guilty of murdering his mother-in-law, his defence argued that he had no motive for the crime and was sleepwalking or experiencing non-insane automatism. Parks himself claimed to have no memory of the incident and had no indication of feeling pain from his injured hands. Similarly, Simon Fraser, who killed his 18-month-old son while believing he was saving his family from a wild beast, was acquitted due to a long history of night terrors and violent somnambulism.
The parasomnia defence has been used in several other cases, including that of Albert Tirrell, who was found innocent due to his history of sleepwalking and "mental derangement". In another instance, Joan Kiger was acquitted of murdering her father and wounding her mother and brother after claiming she was sleepwalking and experiencing a vivid nightmare.
While sleep forensics can provide insight into unusual sleep behaviours, the parasomnia defence is not always successful. In some cases, defendants may not exhibit convincing signs of a sleep disorder, and the presence of malicious intent or premeditation can influence the verdict. Additionally, it can be challenging to prove that a defendant was actually asleep at the time of the crime.
As sleep forensics continues to evolve, our understanding of the relationship between sleep and violent behaviour will likely become more nuanced.
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Sleepwalking and murder weapons
Sleepwalking murder, or "homicidal sleepwalking", is a rare but real phenomenon. In a 2013 study, 58% of the 140 adult sleepwalkers observed displayed violent behaviour during their sleep, with 46% of violent incidents directed toward their sleeping partner.
When sleepwalking, the brain gets stuck between a sleeping and an awake state. During this time, parts of the brain that control movement can be awake while parts that control memory and consciousness remain asleep. Violent behaviour during sleep can occur when a person is trying to act out their dreams. In some cases, individuals wake up to discover they have committed murder while asleep, with no memory of their actions.
The use of the sleepwalking defence in court is rare and not always convincing for juries. However, researchers have found that homicides can be committed by sleepwalkers. In a 2024 analysis of over 30 reported homicides committed during sleep, researchers found several common patterns. The murder weapon was often a gun or sharp object close to the bed, and female family members were more likely to be victims. In many cases, no effort was made by the perpetrator to hide the violent act.
Location and access to a weapon are key factors when sleepwalking turns deadly. If you have a history of sleepwalking, it is advised to keep potential weapons such as firearms, hammers, or knives out of the bedroom.
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Sleepwalking and motive
Sleepwalking, or somnambulism, is a sleep disorder that can result in complex behaviours being carried out while asleep, including violent actions and murder. Sleepwalking occurs when parts of the brain that control movement and speech wake up, while other parts that control memory and consciousness remain in a state of sleep. While sleepwalking and committing violent acts during sleep is rare, it does happen, and it raises complex legal questions about motive and culpability.
In a 2024 analysis of over 30 reported homicides committed during sleep, researchers found several common patterns. For example, the murder weapon was often a firearm or sharp object close to the bed, female family members were more likely to be victims, and most cases involved no effort to hide the violent act. The proximity of the victim to the sleepwalker is also a factor, as is the availability of weapons.
The notion that a person can commit murder while sleepwalking and have no conscious knowledge of their actions is a challenging concept for the legal system. The defence of sleepwalking is rarely asserted, and there is little precedent for defenders to rely on. There is also inconsistency among courts faced with sleepwalking defences, and no objective criteria for evaluating them. As a result, verdicts in homicide cases involving sleepwalking defences have been mixed, and this defence may not always persuade juries.
In some cases, defendants have been successful in arguing that they were sleepwalking and, therefore, not responsible for their actions. For example, in 1987, Kenneth Parks allegedly sleep-drove to his in-laws' home and fatally stabbed his mother-in-law. He had no memory of the incident and was found not guilty of murder and attempted murder on the basis of sleepwalking, or non-insane automatism. In another case, Simon Fraser, who had a long history of night terrors and violent sleepwalking, killed his 18-month-old son while attempting to save his family from an imaginary beast. He was acquitted but ordered to sleep alone in a locked room for the rest of his life.
The use of the sleepwalking defence raises questions about motive. If a person is sleepwalking, they are not acting with conscious intent or premeditation, which are typically required for a murder conviction. Therefore, sleepwalking can provide a motive for violent actions, explaining the absence of a conscious motive. However, proving that a defendant was actually sleepwalking and asleep at the time of the killing can be challenging, and experts note that many defendants who try to use the sleepwalking defence do not exhibit convincing signs of a sleep disorder.
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Sleepwalking and insanity
Sleepwalking, also known as somnambulism or noctambulism, is a sleep disorder characterised by a combination of sleep and wakefulness. It occurs during the slow-wave stage of sleep, when certain parts of the brain remain in a state of sleep while others, such as those controlling movement, are awake. This can result in activities typically performed while fully conscious, ranging from benign behaviours like sitting up in bed to more complex and hazardous actions like cooking or driving. Sleepwalkers often have little to no memory of their actions, as their altered state of consciousness makes recalling memories difficult.
While sleepwalking itself is not uncommon, sleep-related murder is rare. However, it does occur, and the use of the sleepwalking defence in court is not unheard of. In some cases, defendants have been successful in pleading not guilty by reason of sleepwalking or non-insane automatism. One notable example is the case of Kenneth Parks, who fell asleep on his sofa and later found himself standing in his parents-in-law's house with a knife in his hand and his mother-in-law dying in front of him. With no memory of what happened and no apparent motive, he was found not guilty of murder and attempted murder.
The use of the sleepwalking defence, however, is not always convincing for juries and has sparked debates about the need for standardised protocols in sleep-related forensic cases. While some experts argue for a single category of defence for all sleep-related offences, others focus on the control and consciousness of the individual during the act. The term "automatism" is often used in these discussions, referring to a lack of voluntariness or awareness of one's actions. However, the emphasis on control rather than consciousness is supported by clinical science, highlighting the complexities of such cases.
Insanity, in the context of sleepwalking and legal defences, is a contentious issue. The M'Naghten rules, for example, require a "disease of the mind" with internal causes, which can be medically ambiguous. The burden of proof falls on the defendant to prove insane automatism, and the term "insanity" itself has been criticised for stigmatising sleepwalkers. As a result, some have suggested removing the categories of sane and insane automatism altogether and focusing on risk assessment and specialised follow-up for sentencing.
In summary, sleepwalking and insanity are complex topics that intersect with criminal law in intriguing ways. While sleep-related murder is rare, it raises important questions about the role of sleep disorders in criminal behaviour and the need for standardised assessments and diagnoses. The use of the sleepwalking defence, including arguments of automatism and insanity, remains controversial, highlighting the ongoing challenges in balancing legal, ethical, and medical considerations in such cases.
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Frequently asked questions
The use of the sleepwalking defence in court is rare and not always convincing for the jury. However, there have been cases where defendants have been acquitted on the grounds of sleepwalking or non-insane automatism.
Sleep-related murder is still unusual. The average criminal barrister in the UK is unlikely to come across more than one or two cases of sleepwalking in their career.
It is difficult to prove that someone was sleepwalking at the time of the killing. While some defendants have been able to convince the jury by displaying a total absence of recall, others have been found to show no convincing signs of a sleep disorder.
