Coffee later in the day also disrupts our sleep cycles, which continues the vicious cycle of waking up feeling unrested and needing that cup of joe to wake yourself up.

在晚上，咖啡也会扰乱我们的睡眠周期，持续着睡不着无法休息好，然后又只能用咖啡提神的恶性循环。

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Reprogramming your sleep rhythms for two days doesn't do much to help you erase sleep debt, and it throws off your sleep wake cycles just in time for a bad case of Sunday-night insomnia.

在这两天重新安排睡眠节奏对弥补缺觉无大好处，而且它会使你的作息不规律，造成周日晚上的失眠。

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In another experiment the researchers wake up sleeping mice by sending a light signal to the hypothalamus, the brain's controller of sleep-wake cycles.

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