睡眠负债的来源有两种：部分睡眠不足和整体睡眠不足。

There are presumed to be two kinds of sleep debt, caused by partial sleep deprivation or total sleep deprivation.

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这解释了为什么我们缺少睡眠时，认知能力会下降：这时的我们即使不是半睡状态，也是部分睡眠。

That could explain why our sleep-deprived selves are so cognitively challenged: We are, if not precisely half-asleep, partially asleep.

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更多的近来的研究把慢性部分睡眠剥夺和医学疾病联系到了一起，包括肥胖，糖尿病和高血压。

More recent studies have tied chronic partial sleep deprivation to medical problems, including obesity, diabetes and hypertension.

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The hypothalamus is responsible here for feeding, hunger, thirst, and to some extent sleep.

下丘脑控制进食,饥饿,口渴,以及部分的睡眠活动

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