**Core Concept**
Somnambulism, also known as sleepwalking, is a parasomnia that occurs during deep non-rapid eye movement (NREM) sleep. It is characterized by complex behaviors like walking, talking, and performing activities while still asleep. The exact cause of somnambulism is not well understood, but it is believed to be related to disruptions in the normal sleep-wake cycle.

**Why the Correct Answer is Right**
Somnambulism typically occurs in children and adolescents, with most cases reported in the age range of 4-12 years. This age group experiences a significant amount of brain development and maturation, which may contribute to the increased risk of sleepwalking. During this period, the brain's ability to transition between different stages of sleep, including deep NREM sleep, is still developing. As a result, individuals in this age group are more likely to experience disruptions in their normal sleep-wake cycle, leading to somnambulism.

**Why Each Wrong Option is Incorrect**
**Option A:** Early childhood (0-3 years) is not a common age group for somnambulism, as infants and toddlers typically do not have the motor skills or cognitive abilities to perform complex behaviors while asleep.
**Option B:** Young adults (18-30 years) can experience somnambulism, but it is less common in this age group compared to children and adolescents. Other sleep disorders, such as sleep apnea or insomnia, are more prevalent in this age group.
**Option C:** Older adults (65+ years) may experience sleep disruptions and other sleep disorders, but somnambulism is not typically associated with this age group.

**Clinical Pearl / High-Yield Fact**
Somnambulism often runs in families, suggesting a possible genetic component. If a family history of sleepwalking is present, it may be more likely to occur in children and adolescents.

**Correct Answer:** C. Children and adolescents (4-12 years) are the most common age group to experience somnambulism.