Suprachiasmatic nucleus

Suprachiasmatic Nucleus controls circadian rhythms

A part of your hypothalamus (a portion of your brain) controls your circadian rhythm, but outside (exogenous) factors like lightness and darkness can also impact it. When it’s dark at night, your eyes send a signal to the hypothalamus that it’s time to feel tired. The brain then sends a signal to the body to release the hormone melatonin, which makes your body tired. That’s why your circadian rhythm tends to coincide with the cycle of daytime and nighttime (and why it’s so hard for shift workers to sleep during the day and stay awake at night).

Joe Garma
 

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