知道了他妻子可怕的诊断后，大卫开始了他在生命延伸领域上的工作。

David's work in the field of life extension began after his wife's terrifying diagnosis.

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在这个有电灯和通宵工作的时代这也许并不令人惊讶。 但是这份报告的共同作者大卫•萨姆森说，睡眠的这种变化早在我们发明人工照明之前就开始了。

That might not seem surprising in this age of electric lights and round-the-clock activities, but co-author David Samson says this shift began long before we developed artificial lighting.

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