Sleepwalking Sleepwalking is a sleep disorder effecting an estimated ten percent of all humans at least once in their lives. This widespread phenomenon varies in its intensity and frequency. While most sleepwalking incidents are short and not dangerous, some can involve self-injury and are much more dangerous for the sleeper as well as the people around them. Also, most interestingly, the disorder seems to come from many different sources, not just one main cause. While it is predominantly pre-adolescents who suffer from sleepwalking, it is also seen in adults, although the frequency and severity of incidents increase with age. The source of the disorder was once