The SCN is active during the daytime in diurnal animals, like humans, but is active during the night in nocturnal animals, like rodents.

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The SCN (suprachiasmatic nucleus) is active during the daytime in both diurnal animals, like humans, and nocturnal animals, like rodents. Its activity regulates circadian rhythms, influencing sleep-wake cycles according to external light cues, not the animal's activity period.

The SCN Is Active During the Daytime in Diurnal Animals