A person is not guilty of an offence if—
(a) he or she acts in a state of automatism where the act alleged to constitute the offence is committed by him or her involuntarily so that he or she has no control over his or her physical activities due to some external factor which causes him or her to be unconscious or otherwise act without his or her will; and
(b) the act or condition is not the result of anything done intentionally or recklessly or as a result of voluntary intoxication.