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(A)They also found that during sleep, the brain’s cells shrink, or become smaller.
(B)While we sleep, our brains are doing much more than getting ready for the next day.
(C)She said the results demonstrate just how important sleep is to health and fighting disease.
(D)The brain expert says our brains perform two very different jobs.

As with many studies, the researchers turned to mice for help. They studied mice that had colored dye injected into their brains. They observed the mice brains as they slept and when they were awake. The researchers say they saw that the brains of sleeping mice were hard at work. Dr. Maiken Nedergaard led the study.38.The brain expert says our brains perform two very different jobs. It seems they have daytime jobs. Later they “moonlight” at a nighttime job. “Moonlighting” is working a nighttime job in addition to a day job. And this study says that is what our brains seem to be doing – working an extra job at night without additional pay for overtime. Whereas during sleep, they work very, very hard at removing all the waste that builds up when we are awake.

Google翻譯：

與許多研究一樣，研究人員求助於小鼠。他們研究了將彩色染料注入大腦的小鼠。他們觀察了老鼠睡覺時和醒著時的大腦。研究人員說，他們發現睡覺的老鼠的大腦很難工作。 Maiken Nedergaard博士領導了這項研究。大腦專家說，我們的大腦執行兩項截然不同的工作。看來他們有白天工作。後來他們在夜間工作中“月光下”。除日間工作外，“月光下”還在夜間工作。這項研究表明，這就是我們的大腦似乎正在做的事情–晚上做一份額外的工作而無需支付加班費。而在睡眠過程中，他們非常非常努力地清除我們醒著時積累的所有廢物。