Exposition

What is the reason you're doing something is an exposition. For example: Exposition for why you were doing your homework late at midnight. Why would you be doing it at midnight? Obviously, the homework is due the next day or the day after and you were finishing it up. Why look for it at midnight? Exposition: Ya think ya folks are sleepin', but they have eyes everywhere. So, you look for your homework. Anyway, these things I've typed with expositions aren't what I do. Good Bye!