The sleepwalker's eyes are open but may appear as a glassy-eyed stare or blank expression and pupils are dilated.
The clear, prompt improvement of severe parasomnia in children who are treated for SDB, as defined here, provides important evidence that subtle SDB can have substantial health-related significance.
In some cases, sleepwalking in adults may be a symptom of a psychological disorder.
One study suggests higher levels of dissociation in adult sleepwalkers, since test subjects scored unusually high on the hysteria portion of the "Crown-Crisp Experiential Index".
Three common diagnostic systems that are generally used for sleepwalking disorders are International Classification of Diseases, Sleepwalking should not be confused with alcohol- or drug-induced blackouts, which can result in amnesia for events similar to sleepwalking.
During an alcohol-induced blackout (drug-related amnesia), a person is able to actively engage and respond to their environment (e.g.