Typically, the sleeping child suddenly sits up. His or her movements are clumsy. There may be repetitive movements of the fingers and hands. The child's eyes may be open, but with a blank stare. Sometimes the child gets out of bed and walks around without purpose. More often, he or she simply lies down again after a period of restless motion. The child may perform clumsy, but purposeful activities such as trying to open a door or trying to get dressed.
The child usually cannot be awakened during one of these episodes. When spoken to, he or she may answer with mumbling and slurred speech. An episode can last 5 to 20 minutes. Afterward, the child lies down and goes back to sleep.