Experts say stress and sleep deprivation can be factors in cases where sleepwalkers kill loved ones while asleep, reports

Dr Matthew Wolf-Meyer has been researching sleep disorders since 2003. He knows the case well and said Mr Parks had a history of similar behaviours. He said Mr Parks was physically stressed at the time which may have played a role.

“When you look at a case like Kenneth Parks, it was kind of a perfect storm of circumstances that led to his sleepwalking behaviours,” he told

“It’s very unlikely that the first instance of someone sleepwalking is when (they kill), but if an individual has a history of parasomnias, aggression while sleeping is definitely on the continuum of likely possibilities.”