原句子：For
students, less sleep also predicts more conflicts in friendships and romantic
relationships (Gordon & Chen, 2014; Tavernier & Willoughby, 2014). Tired triggers crabby. In another
survey, 28 percent of high school students acknowledged falling asleep in class
at least once a week (National Sleep Foundation, 2006). 这个句子；来源于戴维斯的心理学P107.
大概的意思是：疲劳状态容易让人易怒，引发脾气的乖戾。
在这里tired 显然是形容词，而且也不是形容的名词化，后面的crabby
也是形容词。而trigger是动词。
这是什么用法呢？还是Tired 真的直接做名词用了？
