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
NREM sleep is associated with:- 
Select and explain. 
A. Basal forebrain area, B. Dorsal raphe nucleus, C. Medulla, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: NREM sleep generation is associated with 5 anatomical sites: * Basal forebrain area Thalamus Hypothalamus Dorsal raphe nucleus Nucleus tractus solitaries of the medulla Preoptic lesions produce hyposomnia, whereas electrical and thermal stimulation of this area produces sleep changes. Thalamus (especially reticular formation) plays an active role in production of coical sleep spindles and delta waves.