Your brain cells renew and studies show that people who don't get adequate sleep do worse on cognitive and memory tasks.
你的大脑细胞在这个过程中更新。研究表明，缺乏睡眠会使认知及记忆变差。
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New moms may feel their brain cells dying with every cumulative hour of sleep loss. But a new study offers hope.
产后妈妈可能会感觉他们的脑细胞随着睡眠在一分一秒的减少。但是新的研究让我们看到希望。
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When you sleep, your body produces human growth hormone (HgH), which not only builds muscle, but also stimulates your bone marrow, where immune cells are created.