At Night, the Suprachiasmatic Nuclei (SCN) Located in the Hypothalamus

At night, the suprachiasmatic nuclei (SCN) located in the hypothalamus

A) are inactive allowing melatonin levels to increase thereby promoting relaxation and sleepiness.
B) are inactive allowing melatonin levels to decrease thereby promoting relaxation and sleepiness.
C) are stimulated directly from the cortex.
D) are more active allowing melatonin levels to increase thereby promoting relaxation and sleepiness.
E) are more active allowing melatonin levels to decrease thereby promoting relaxation and sleepiness.