In normal circumstances, however, the SCN reacts to the lengthening nights by instructing the brain's pineal gland to secrete more of the hormone called melatonin.

然而，在正常情况下，SCN对夜晚延长的反应是，它会指示大脑的松果腺增加褪黑激素的分泌。

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Melatonin, a hormone produced by the pineal gland in response to darkness, is thought to play a primary role in controlling the body's circadian rhythm.

褪黑激素，黑暗时松果腺产生的一种激素，被认为在控制身体昼夜节律起主要作用。

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Melatonin is an important hormone synthesized and secreted by the pineal gland.

褪黑素是人体脑内松果腺合成与分泌的一种重要激素。

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Melatonin products are usually synthetic versions of the hormone made naturally by the pineal gland, in the brain, which helps regulate the body's sleep-wake cycle.

CNN: Should your teen take melatonin for help with sleep?