It is revealed that prior to this episode, Adam had been pulling all-nighters for three weeks straight in order to pass his mid-terms. And that's what caused him to act weird. It also explains why Adam briefly acted weird in A Mid Semester Life's Dream. He was already feeling the effects of insomnia. So all the events between A Mid Semester Life's Dream and Human Behavior took place within three weeks. Glazed and Confused only took one entire week.