为什么夜深了头痛难受但还不想睡？
Why late at night have a headache afflictive but not dozy still?
偏头痛的时候，人们总是会缩在洞穴一般的小黑屋里，可到底为什么明亮的光线会让偏头痛者感到难受呢？
When people suffer from a migraine, they often retire to a cave-like dark room. But exactly why does bright light hurt the migraine sufferer?
我头痛，难受得很，亲爱的。
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