Criminal law (2022): Defenses to liability: Automatism (law) (Part Two)

Sleep.

The Australian Model Criminal Code Committee states the law as follows:

At the minimum there needs to be some operation of the will before a physical movement is described as an act. The physical movements of a person who is asleep, for example, probably should not be regarded as acts at all, and certainly should not be regarded as acts for the purposes of criminal responsibility. These propositions are embodied in the rule that people are not held responsible for involuntary 'acts', that is, physical movements which occur without there being any will to perform that act. This situation is usually referred to as automatism.

In the U.S., People v Huey Newton (1970) holds that unconsciousness, when not self-induced (say, as by voluntary intoxication), is a complete defense to a criminal act even though the defendant's acts seem very goal-oriented. The medical evidence was that " gunshot wound which penetrates in a body cavity, the abdominal cavity or the thoracic cavity is very likely to produce a profound reflex shock reaction, that is quite different from a gunshot wound which penetrates only skin and muscle and it is not at all uncommon for a person shot in the abdomen to lose consciousness and go into this reflex shock condition for short periods of time up to half an hour or so." But the reflexive activity or unconsciousness need not cause physical collapse: it can exist where the subject physically acts in fact, but is not at the time conscious of acting (cf some European continental jurisdictions classify conduct resulting from automatism under the rubric of unconsciousness). In R v Cogdon (1950), unreported but noted in Morris, Somnambulistic Homicide: Ghosts, Spiders and North Koreans (1951), the defendant struck her daughter on the head with an ax while sleepwalking and dreaming about North Koreans. Her movements were not voluntary, so she was acquitted. This interpretation of automatism is consistent with Lord Denning's dicta in Bratty v Attorney-General for Northern Ireland (1963):

No act is punishable if it is done involuntarily: and an involuntary act in this context – some people nowadays prefer to speak of it as 'automatism' – means an act which is done by the muscles without any control by the mind, such as a spasm, a reflex action or a convulsion; or an act done by a person who is not conscious of what he is doing, such as an act done whilst suffering from a concussion or whilst sleepwalking.

Situations involving hypnotism, concussion, and sleepwalking may involve apparently deliberate and purposeful conduct. In fact this is the case for many situations where the defense of automatism is presented – spasms or reflex actions are rarely likely to be perceived as criminally liable acts. As for sleepwalking itself, the Canadian case of R v Parks exemplifies a certain judicial willingness to regard a sleepwalker as behaving as an automaton even though he had performed apparently goal-directed acts. The accused fell asleep in his living room. A few hours later he got up and drove 23 kilometers to his in-laws' home. Still asleep, he entered the house, found a knife in the kitchen and went to the bedroom where his in-laws were sleeping. He strangled and cut his father in-law, who survived the attack. The mother in-law died from the repeated stab wounds and the brutal beating. The medical experts at trial unanimously agreed that the accused was sleepwalking and that sleepwalking was not a "disease of mind". The Supreme Court agreed and held that sleepwalking can negate the voluntary ingredient of the actus reus. There is widespread disagreement among forensic sleep experts that Kenneth Parks was in fact sleepwalking – it is not entirely clear the reason why the prosecution did not call its own experts on sleepwalking, one explanation being frank disbelief that the defense could succeed.