in the hypothalamic nuclei
suprachiasmatic, subparaventricular, dorsomedial
ligth goes to eye-->retina-->hypothalamus-->cicadian rythemn
if you are blind circadian rythem is off and can experience alterations in sleep/wake cycle
it is when there is no light stimuli to connect internal circadian
-they are a pair of excitatory neuropeptide hormones
-they are primarily involved in stimulation of food intake
WAKEFULNESS and energy expenditure
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