A sleep disorder in which one moves around, performing various
activities, while asleep or nearly asleep; episodes are
typically not remembered the next day. A family history of
sleepwalking, also known as somnambulism, is often to blame, but
stress or other psychological factors can play a role as well.
Example: A man’s wife sees him leave his bed without waking and
wander through the house. After a few minutes, he awakens and
quickly reorients himself. This is an extremely comprehensive
overview of the sleepwalking disorder, the symptoms and the
causes:
http://www.emedicinehealth.com/sleepwalking/article_em.htm Last
reviewed: By John M. Grohol, Psy.D. on 6 Aug 2010