melatonin

Sunlight can refrain the growth of melatonin in the body.

阳光能抑制身体中褪黑激素的生长。

So make your room dark and sleep early in the night allowing your body to produce melatonin.

所以晚上睡觉要保证房间黑暗并且早睡，这样能促进褪黑激素的产生。

To explain how light exposure at night might affect the moods of both hamsters and people, the researchers turn to a hormone called melatonin.

为了解释夜间曝光是如何影响仓鼠和人类心情的，研究人员转向了一种叫褪黑激素的荷尔蒙。