What information does the title of "Looking at the West Garden at Night and Looking at the Moon" provide?

It's a late autumn night. The late autumn climate in Yongzhou is pleasant, but Liu Zongyuan, who is in a foreign land, feels a chill. It's already midnight when I wake up at night. All the fields are silent and the windows are as bright as day. The dream of that moment is still vivid. The poet tossed and turned, unable to sleep any more, bored, and even heard the subtle sound of dew dripping, and the environment was very quiet. Dew drops are not easy to detect. Here, "smell" is used to deliberately express subtle feelings. So he simply got up and "opened an account in Xiyuan".