it运维工程师考证:why so sleepy

In winter, people tend to get sleepy, perhaps because the days are shorter and the nights are longer. It's also because people are eating more and wearing more clothes.
另外:
从人的生理学的讲,人困是非常正常的,因为人的大脑经过长时间的工作或学习,已经很疲劳了,需要休息了,那样人就会困.另一种是由于人生病了,一般总困的人,多半由血稠所至,但也有一些别的病理会使人发困.
Physically it's quite natural for human beings to be sleepy, because human brains are tired through working or learning for a long time. Hence, people got sleepy. Another reason is that people are sleepy because they are ill. Generally speaking, people are sleepy mainly due to the strong density of their blood, but of course, other pathologies may lead to sleepiness too.

没有休息好，神经衰弱，多半会白天很困。吃点安神的药，不要想太多，减轻点压力。睡觉的时候听点轻音乐。

或者是太劳累了，就会疲乏昏昏欲睡，这样的情况还是马上休息比较好，吃些补脑的补品。

还有一种是缺氧，大脑缺氧，或者供血不足所以会困。可以呼吸新鲜空气，或者直接吸氧【会HIGH哦～】，还有做点轻微运动，或者喝一点点酒，加快血液循环。