Le site de vulgarisation scientifique de l’Université de Liège. ULg, Université de Liège
suprachiasmatic nucleus

The suprachiasmatic nucleus is located in the hypothalamus. It regulates melatonin, a hormone secreted when the light fades, plunging the body into a state of somnolence. It is therefore responsible for controlling the circadian rhythm, commonly known as the 'biological clock'.  

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