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Recently, Medical News Today reported on a study that found that specialized immune cells are more active in the brain during sleep, busy performing maintenance work. 最近《今日医学资讯》就一项研究进行了报道，研究发现睡觉时大脑中的特异性免疫细胞更活跃，在进行繁忙的维护工作。 Researchers know that sleep is important — not just in terms of allowing the brain to reactualize, but also for "making space" for "cleaning" processes to take place. 研究人员知道睡眠不仅对于大脑重新开始工作非常重要，而且有助于为“清理”过程“腾出空间”。 However, many of the mechanisms through which this clearing out of brain waste takes place during sleep remain unclear. 然而人类依然不清楚大脑在睡眠期间清理大脑垃圾的很多机制。 Now, researchers at Boston University in Massachusetts have found that during sleep, the fluid present in the brain and spinal chord — called the cerebrospinal fluid — washes in and out, like waves, helping the brain get rid of accumulated metabolic "trash." 现在马萨诸塞州波士顿大学的研究人员发现睡眠期间存在于大脑和脊髓中的脑脊液进进出出，就像波浪一样，帮助大脑清除堆积的代谢“垃圾”。 "We've known for a while that there are these electrical waves of activity in the neurons. But before now, we didn't realize that there are actually waves in the cerebrospinal fluid, too," study co-author Laura Lewis explains. | 
