为啥一到冬天起床就特别困难？真不是因为懒
Have a hard time waking up when it’s cold out? Scientists say blame your brain

A study conducted by neurobiologists from Northwestern University made it possible to elucidate the mechanisms underlying 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。

They show how, through this circuit, seasonally cold and dark conditions can inhibit 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。

The study, led by Gallio and conducted in Drosophila melanogaster, was published in the journal Current Biology.这项研究由加利奥主导，研究对象为黑腹果蝇，研究成果发表在《当代生物学》杂志上。

Having identified those neurons, the researchers followed them all the way to their targets within the brain. They found the main recipients of this information are a small group of brain neurons that are part of a larger network that controls rhythms of activity and sleep. When the cold circuit they discovered is active, the target cells, which normally are activated by morning light, are shut down.在识别出这些神经元后，研究人员一直追踪，发现了它们在大脑中对应的靶细胞。研究人员发现这些信息的主要接收者是一小群大脑神经元细胞，它们是控制活动和睡眠规律的大脑神经网络的一部分。当温度提示回路被激活时，通常可以被晨光激活的这些靶细胞就会休息。