Sleepwalking disorder is a mixed state between sleep and wakefulness. It appears as a narrowing of the range of consciousness, perceptual disturbances, and behavioral disturbances, and psychosocial factors can act as triggers. It can manifest itself by suddenly rising during sleep, walking barefoot, performing simple and sometimes complex activities, and then falling asleep again, waking up with no knowledge of the activities during sleep. Nocturnal sleepwalking is not what is commonly referred to as dreaming, which occurs in the first 2-4 hours after going to sleep. Sleepwalking mostly occurs between the ages of 5 and 12, but it is more common between the ages of 5 and 7 and lasts for several years, and it mostly disappears on its own after entering puberty. The incidence of sleepwalking is higher in males than in females, and the high incidence of sleepwalking in families with a history of sleepwalking suggests that sleepwalking has a certain heredity. Sleepwalking is characterized by one or more episodes of sleepwalking, where the patient gets up suddenly for no reason, walks around aimlessly and like no one else, does not answer questions, has a blank expression, stares blankly, does not respond when asked by relatives, and is difficult to be awakened. The patient then returns to bed and goes back to sleep. Upon awakening, the patient cannot recall the seizure, and examination at the hospital often shows no evidence of organic disease. Psychosocial factors such as mental stress have a relationship with the occurrence of sleepwalking disorder. For example, sleepwalking can be triggered by excessive daytime exertion and continuous sleep deprivation. Some studies have shown that a positive family history of sleepwalking is common in the families of patients with sleepwalking disorder, and the rate of homozygosity is higher in monozygotic twins than in dizygotic twins, suggesting a relationship between the disorder and genetic factors. Because the disease occurs mostly in childhood and the episodes stop gradually with age, it suggests that sleepwalking may be related to delayed cortical development. Occasional episodes that resolve in a few minutes may not require treatment, but recurrent episodes should be seen at a local children’s hospital. As the patient’s family, we should strengthen the supervision of patients with sleepwalking to prevent accidents such as falls, burns or wandering during seizures.