Deep sleep is critical to maintaining a robust memory, but both decline with age.
深度睡眠对保持良好的记忆力非常关键，但不管是深度睡眠状况还是记忆力本身，都会随着年龄的增长而出现衰退情况。
A small new study published in Frontiers in Human Neuroscience suggests that one easy way for older adults to get deeper sleep and stronger memories is to listen to a certain soothing sound called “pink noise”—a mix of high and low frequencies that sounds more balanced and natural than its better-known cousin, “white noise.”
《人类神经科学前沿》期刊上发表的最新研究表明，老年人想要睡得更深和提高记忆力有个简单的方法，那就是听抚慰人心的“粉红噪音”。“粉红噪音”混合了高频和低频的声音，听上去比更出名的“白噪音”更加和谐自然。
那么什么是粉红噪音呢?粉红噪音(pink noise)是自然界最常见的噪音，它主要分布在中低频段，瀑布声和小雨声都可称为粉红噪音。“粉红噪音”这名称起源于这种噪声是介于白噪音与褐色噪音之间。
It may sound strange, but previous studies have found that playing so-called pink noise during sleep improves the memory of younger adults.
这听上去也许有些奇怪，但之前的研究发现，在睡眠时播放粉红噪音可以提高年轻人的记忆力。
