褪黑素与我们的睡眠质量密切相关，下面的新托福考试阅读资料要讨论的就是褪黑素有助睡眠的原因。

　　Melatonin, sometimes called “the hormone of darkness,” plays an important role in regulating our daily sleep patterns. This hormone is produced by our bodies and in most organisms melatonin production is higher during the night than during the day.

　　褪黑素，又名黑素细胞凝集素的荷尔蒙，在调节我们日常睡眠规律中扮演重要角色。人体自身分泌褪黑激素，而且大多数生物夜晚比白天分泌得更多。

　　In addition to their body’s own melatonin, many people take melatonin supplements in an attempt to help them sleep, fight jet lag or balance out seasonal affective disorder.

　　此外，一些人通过体外补充褪黑素改善睡眠，缓解飞机时差感、平衡季节性情绪失调。

　　Melatonin And Memories

　　褪黑素对记忆的影响

　　But a study by a group of scientists at the University of Houston suggests that melatonin might have a negative impact on the ability to form new memories.

　　但是，休斯顿大学的科学家们研究表明：褪黑素阻碍记忆形成。

　　The researchers were interested in how the body’s internal clock affects the formation of new memories. They found that small striped minnows called zebra fish learned very well during the day but very poorly at night, when melatonin levels are higher.

　　研究人员想弄清楚体内生物钟如何影响新生记忆的形成。研究人员发现斑马鱼白天学习能力很好;夜晚却很差，而夜晚褪黑素分泌旺盛。

　　They wondered if melatonin played a role in learning and memory.

　　研究人员怀疑褪黑素影响学习和记忆。