Non-REM Arousal Disorder is characterized by sleep walking and sleep terrors with incomplete awakening; episodes occur during which portion of the major sleep episode?

• A. Nightmare Disorder
• B. Non-REM Arousal Disorder
• C. REM Sleep Behavior Disorder
• D. Panic Disorder

Answer: (B)

Non-REM arousal disorders arise from incomplete awakenings during slow-wave sleep, the deepest stage of non-REM sleep. These episodes typically occur in the first third of the major sleep period, when slow-wave sleep is most prominent, leading to sleepwalking or sleep terrors. This pattern distinguishes them from REM-related issues like Nightmare Disorder or REM Sleep Behavior Disorder, and from Panic Disorder, which is not a sleep disorder.