Sleepwalking, also known as somnambulism, is a behavior in which a person gets up during the night and walks or performs other activities. The person usually does not remember getting up or being engaged in what they do. Sleepwalking tends to occur during the first part of the night, usually within an hour or two of falling asleep. Almost 18% of us sleepwalk at some point in our lives and there are many possible causes, but sleepwalkers rarely suffer from emotional or psychological problems. Monitoring the sleep of a sleepwalker at a specialist centre can be a difficult task as sleepwalkers rarely perform their ‘normal’ nightly routine when not at home.