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可可电台，每期节目一话题，让英语磨练耳朵的同时学到更多有益的小知识，丰富知识的同时受益于生活。
Better Sleep
高质量睡眠
Know your sleep type
了解你自己的睡眠类型。
Some people like Margaret Thatcher,Gandhi and Winston Churchill may have famously thrived on less sleep but they're a rarity.
诸如撒切尔、甘地和丘吉尔等人即使睡眠很少看起来也容光焕发，但是他们毕竟是少数。
In fact, researchers at the University of California,San Francisco discovered a gene mutation in people that predisposed them to needing about 20per cent less sleep than the rest of us.
事实上，加州大学的研究者们发现某些人身体中存在一种基因突变，使得他们所需睡眠要比其他人少20%。
But they estimate those’short-sleepers’ only comprise around five per cent of the population.
但是他们估计这些人只占全部人口的5%左右。
【知识点讲解】
gene n.<生>基因； 遗传因子；
例句：
He found evidence of mutated forms of the gene.
他找到了该基因出现了变异形式的证据。
It is far too early to make sweeping statements about gene therapy.
现在对基因疗法下结论还为时过早。
The gene is only part of the causation of illness.
基因只是致病的部分原因。
mutation n.变化； 转变； 突变； 变异
例句：
cells affected by mutation
受到突变影响的细胞
Scientists have found a genetic mutation that appears to be the cause of Huntington's disease.
科学家们已经发现了一种可能是引起亨廷顿舞蹈病的基因变异。
This mutation makes it better adapted than the other four.
这种变异使它具有比其他四只猪为大的适应能力.
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