
Keywords: SST، somatostatin; BLD, bright light/dark; DLD, dim light/dark; ir, immunoreactive; LD, light/dark cycle; OXA, orexin-A peptide; OX1R, orexin-1 receptor; PaVN, paraventricular nucleus; PeVN, periventricular nucleus; SP, short photoperiod; SST, somatostatin; TH, tyrosine hyd