Why do you think the novel is titled The Sun Also Rises?

I really don't know why the book was named "The Sun Also Rises", but I am just going to guess. Sun rises, and sun also goes down, but sometimes when people feeling down or facing problems, then it's just like the sun falling down. In the book, it describes about the bullfight fiesta. The fiesta is noisy and filled with laughters and dances. But when the fiesta is over, people just starts calming down and back to normal. The reason it is "The Sun Also Rises", I guess it's because in life you might be confused and lost, but the sun will always rise, so don't give up.