进入寒冷的冬季，很多人都有早上起床困难的问题。不管闹钟响了几次，总是感觉睡不醒，“被窝里面好暖好舒服，哪里都不想伸出来。”
这是咋回事儿？难道一到冬天，人也会像有些动物一样需要冬眠吗？今天我们就从科学角度详细说说，为什么冬天起床更困难。
A study conducted by neurobiologists from Northwestern University made it possible to elucidate1 the mechanisms2 underlying3 this phenomenon.
美国西北大学神经生物学家进行的一项研究或许能解释导致这种现象的机理。
Their study on fruit flies, has found a thermometer circuit can transfer information about cold temps from their antennas5 right to the brain.
他们在对果蝇的研究中发现了一个温度提示回路，可以将低温信息从触角传输到大脑。
They show how, through this circuit, seasonally6 cold and dark conditions can inhibit7 neurons within the fly brain that promote activity and wakefulness, particularly in the morning.
研究显示，通过该回路，季节性寒冷和黑暗环境可以抑制果蝇大脑中促进活动和清醒的神经元，特别是在早晨。
"This helps explains why -- for both flies and humans -- it is so hard to wake up in the morning in winter," said Marco Gallio, associate professor of neurobiology in the Weinberg College of Arts and Sciences. "By studying behaviors in a fruit fly, we can better understand how
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