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Sleepwalking or somnambulism is a sleep disorder where the sufferer engages in activities that are normally associated with wakefulness while asleep. While it is more common in children (1 - 17% of children, more frequent in boys), sleepwalking can affect people of any age.

Activities such as eating, dressing or even driving cars have also been recorded as taking place while the subjects are technically asleep. There are even very rare instances of sleepwalkers, unknowingly, committing murder while in this trance-like condition. Most cases of sleepwalking, however, usually consist of walking, without the conscious knowledge of the subject.

Sleepwalkers engage in their activities with their eyes open so they can navigate their surroundings, not with their eyes closed and their arms outstretched as parodied in cartoons and Hollywood productions. The victims eyes may have a glzed or empty appearance and if questioned, the subject will be slow to answer or unresponsive.

A common myth surrounding this disorder is that one should never awake a sleepwalker while they are engaged in the activity. In truth, there is no implicit danger in waking a sleepwalker, though the subject may be disoriented or embarrased when awakened.

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