The Sleepwalking Assailant
Owen has a documented sleep disorder and a history of sleepwalking. On a camping trip, he shares a tent with his friend Sam. At 3 a.m., Sam is awakened by Owen striking him repeatedly. Sam escapes with bruises and a cut. Owen has no memory of the event. Two sleep specialists state that Owen was likely in a non-REM parasomnia at the time, that such episodes can involve complex movement, and that Owen had no conscious awareness. Owen had consumed three beers that evening, though he usually avoids alcohol because it worsens his condition. He had never previously harmed anyone during an episode. The jurisdiction recognizes automatism as a complete defence where the movement was involuntary, but not where the condition was self-induced.
1. Evaluate whether Owen can rely on automatism, addressing voluntariness and the effect of alcohol.
Read the worked answer
Automatism requires that the defendant's movements were involuntary, meaning the body acted without the mind's direction. The specialists' evidence supports that: a non-REM parasomnia can produce complex movement without conscious awareness, and Owen has no memory of the event. If accepted, that negates the actus reus, because the act must be voluntary.
The alcohol is the decisive problem. The jurisdiction excludes automatism where the condition was self-induced. Owen knew alcohol worsens his condition and drank three beers anyway. That knowledge supports a finding that he foresaw or ought to have foreseen the risk of an episode. Even if the alcohol did not cause the episode, it removed the normal controls that might have prevented it.
The prior harmlessness is relevant but not decisive; the risk was known from the diagnosis, not from past violence.
Conclusion: automatism is available in principle but likely fails because of self-induced intoxication. The exam point is that an involuntary act is a defence, but a voluntarily taken risk can bar it.
2. If automatism fails, what offence, if any, best fits Owen's conduct, and what mental state must be shown?
Read the worked answer
If automatism fails, the analysis moves to assault. Assault requires an unlawful application of force, and battery requires actual physical contact. Owen struck Sam repeatedly, causing bruises and a cut, so the actus reus is satisfied.
The mental state is the difficulty. If Owen was unconscious, he did not intend or foresee the contact. The prosecution would need to show either that he was reckless in drinking despite knowing the risk, or that the jurisdiction treats self-induced automatism as leaving the defendant responsible as if he had acted with the mental state of the sober person.
On recklessness: Owen knew alcohol worsens his sleep disorder, and he chose to drink in a shared tent. A jury could find that he consciously took an unjustified risk of harming Sam. That is the strongest route to liability.
On the alternative: if the jurisdiction applies a prior-fault doctrine, the intoxication is treated as supplying the mental state for the offence.
Conclusion: the best fit is assault or battery, with liability resting on recklessness in drinking despite the known risk. The exam point is that a failed automatism defence does not automatically produce liability; the mental state must still be proved.