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This chapter presents the case study of a male adult sleepwalker with recurrence of sleepwalking events previously suffered in childhood. It describes the clinical history, examination, and the results of the procedures performed and the results obtained. He had a history of sleep-walking in childhood but stopped exhibiting events after the age of 14 years. The patient underwent polysomnography (PSG) because the episodes were frequent, violent and potentially dangerous to his wife. He had had 40 hours sleep deprivation previously. A diagnosis of sleepwalking (somnambulism) was made. Sleep deprivation and irregular hours were the main triggers of recurrence of sleepwalking in this patient. The PSG was also important to exclude the presence of concurrent sleep disorders such as sleep apnea and periodic limb movement disorder (PLMD), as both conditions can precipitate sleepwalking events by producing sleep instability secondary to arousals.
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