Sleepwalking is a family disease that mainly affects boys. It usually occurs at the age of 8 to12 years, although it may also appear at an early age. The disorder tends to disappear in adulthood. The episodes of nocturnal wandering occur about one hour after falling asleep, exiting deep sleep. The sleepwalker wanders around the house in a quite coordinated manner but can hit objects and hurt himself. He or she retains some memory of what happened. It is a myth that is dangerous to wake a sleepwalker. Instead, the sleepwalker should be gently brought back to his or her bed. One way to avoid episodes is to sleep in a sleeping bag.