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A phenomenon occurring occasionally during Stages III and IV NREM sleep, usually during the first third of the night, in which the sleeper manifests complex motor activity, including rising from bed and walking about with a blank facial expression, and is unresponsive and difficult to awaken, with amnesia for the episode the following morning. Also called noctambulation or somnambulism. See also sexsomnia, sleepwalking disorder.

Subjects: Psychology.

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