This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Disorders, Subject name: Psychiatry
Benzodiazepines are used in treatment of somnambulism, as they- 
Select and explain. 
A. Increase the duration of NREM III and IV, B. Increase the duration of REM sleep, C. Decrease the duration of NREM III and IV, D. Decrease the duration of REM sleep
C: Decrease the duration of NREM III and IV
Answer: C: Decrease the duration of NREM III and IV 
Explanation: Somnambulism / Sleep walking Usually seen in children. disorder of NREM sleep No treatment is required in most of the cases ,as it remits itself. BZDs are used if the symptoms are severe as the duration of Stage 2 is increased and that of Stage 3 and 4 is decreased, in which somnambulism is seen.