The suprachiasmatic nucleus (SCN) is a tiny but powerful structure in the brain that plays a massive role in how our bodies function on a daily basis. Often referred to as the master clock, the suprachiasmatic nucleus controls your circadian rhythm—the internal 24-hour cycle that regulates sleep, hormone release, body temperature, digestion, and other essential biological processes. Understanding what the suprachiasmatic nucleus does, how it works, and why it matters is key to improving your sleep, mental clarity, and overall health. Where Is the Suprachiasmatic Nucleus Located? The suprachiasmatic nucleus is located in the hypothalamus, just above the optic chiasm…