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Scientists think the answer lies with the accumulation of waste products in the brain.
科學家認為，答案在于大腦中廢物的積累。
During our waking hours, our cells are busy using up our day's energy sources,
在我們醒著的時候，我們的細胞都在忙著用我們一天的能源，
which get broken down into various byproducts, including adenosine.
其中細分為各種副產品，包括腺苷。
As adenosine builds up, it increases the urge to sleep, also known as sleep pressure.
隨著腺苷的積聚，它增加了沖動睡覺，也被稱為睡眠壓力。
In fact, caffeine works by blocking adenosine's receptor pathways.
事實上，咖啡因通過阻斷腺苷的受體途徑來起作用。
Other waste products also build up in the brain, and if they're not cleared away,
其他廢物也在腦中積聚，如果他們不清理掉
they collectively overload the brain and are thought to lead to the many negative symptoms of sleep deprivation.
而共同使大腦超載，這被認為是導致睡眠剝奪的諸多不良癥狀的原因。
So, what's happening in our brain when we sleep to prevent this?
那么，當我們睡覺時，我們的大腦發生了什么事來阻止這種情況呢？
Scientists found something called the lymphatic system,
科學家發現淋巴系統，
a clean-up mechanism that removes this buildup and is much more active when we're asleep.
一個清理機制，能消除這種堆積并且當我們睡著了更加活躍。
It works by using cerebrospinal fluid to flush away toxic byproducts that accumulate between cells.
它的工作原理是利用腦脊液沖走在細胞之間的有毒的副產品。
Lymphatic vessels, which serve as pathways for immune cells, have recently been discovered in the brain,
淋巴管，它作為途徑免疫細胞，最近在大腦中被發現，
and they may also play a role in clearing out the brain's daily waste products.
他們也可能清理出大腦的日常廢品。
While scientists continue exploring the restorative mechanisms behind sleep,
雖然科學家繼續探索背后的睡眠恢復機制，
we can be sure that slipping into slumber is a necessity if we want to maintain our health and our sanity.
我們可以肯定的是如果我們要保持我們的健康和理智，陷入睡眠是必要的。
