in a brain structure known as the suprachiasmatic nucleus, or SCN.3 A structure of a mere fifty thousand cells, the SCN snuggles like a tiny egg within the larger nest of the brain’s hypothalamus. Don’t be fooled by its size, because the SCN is incredibly important. It’s your body’s central internal clock. It tells you when to feel tired, when to feel alert, and when to get hungry. It also drives the nightly task of cellular housekeeping, when damaged parts are swept away and DNA is repaired.4 When your SCN is working well, you’ll have more energy when you need it, deeper rest at night, and
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