At night, he fell into sleep because of extreme sleepiness and exhaustion. His arms still thrashed mechanically. His hands smacked the water surface and he would awake and continued to swim ahead.

夜里，他因极度困倦睡着了，手臂还在机械地划水，手拍到水面上，人惊醒了就继续向前游。

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The condition, which can cause extreme daytime sleepiness, can be effectively treated with a special breathing device that alleviates the blockage by pushing air into throat.

这种情况造成患者白天过度倦怠，通过特殊的呼吸装置向咽部正压送气，可缓解气道阻塞，有效治疗该病。

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Narcoleptics suffer not only from sleepiness, but also from sudden loss of muscle tone that, in extreme cases, can cause them to collapse and remain frozen-fully conscious-for minutes at a time.

发作性睡眠患者不仅困倦嗜睡，而且还突发肌力失调。在一些极端的例子中，甚至引起虚脱和数分钟意识完全清醒地僵直发作。

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