As he thus sat, his eyes would keep open no longer, and he felt a desire to sleep.

当他坐着的嘶吼，他的眼睛再也睁不开了，他想睡觉。

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The prefrontal cortex of the brain, responsible for logic and reasoning, is inactive during sleep, thus allowing all sorts of crazy images to evolve uncensored.

大脑前额叶皮层具有承担逻辑和推理的功能，当人进入睡眠状态时，它也进入休息状态，这就给了其他各种疯狂怪异的图片随意出现在梦境的可能。

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The explanation is that spicy food can elevate body temperatures and thus disrupt sleep.

原来，人体摄入辛辣食物后体温会升高，干扰睡眠。

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Your brain senses trouble and tells your body to release adrenaline-like substances into the bloodstream the so-called fight-or-flight reflex which increases blood pressure, thus the link to sleep apnea and high blood pressure.

CNN: Sleep apnea: Can it cause heart disease?

Thus caffeine can be used to help you sleep, and poison ivy can cure itching.

FORBES: New British Minister of Health believes in magic potions

These have the virtue of being more clear-cut than friendships (did you sleep together or didn't you?) and thus what is or is not a link between nodes is unambiguous.

ECONOMIST: What maths tells us about us