<prompt> NREM sleep is associated with:-Basal forebrain areaDorsal raphe nucleusMedullaAll of the above  <response>: 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. 