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POPSSleepwalking Disorder: Causes, Symptoms and Treatments Sleepwalking disorder, also called somnambulism, is characterize by repeating episodes of motor activity during sleep such as sitting up in bed, rising, and walking around, among others. The person appears to be awake because their eyes are usually open and they can maneuver around objects, but is considered asleep. Sleepwalking disorder is one of several sleep disorders