APA format. www.easybib.com/reference/guide/apa/book
When he said that he means that he feels tired and out of sorts.
Hamlet comments on Alexander the Great in this scene, because when he holds up Horatio's skull, he thinks about how it does not matter who a person is during his or her lifetime, all people are the same once they die. He goes on to describe that even a person as prominent as Alexander the Great will rot and decay like everyone else, regardless of his importance during his lifetime.
