Initial Reaction to the note at the beginning of "Sleepy Hollow"

Right when i heard we were going to be reading something scary i was excited so i jumped right into this story. The note at the top of the story, which almost looked like a quote, intrigued me;
 

A pleasing land of drowsy head it was,
Of dreams that wave before the half-shut eye; And of gay castles in the clouds that pass, Forever flushing round a summer sky. CASTLE OF INDOLENCE.

I did not understand this that much at first at all. To me, its just talking about a person falling asleep into a very nice dream, and the fact that this is put at the begging of a supposed scary folk tale is interesting.