"Once upon a midnight dreary, while I pondered, weak and weary,"
Explanation:
This makes the tone gloomy because it informs the reader(s) that Poe is weak and weary. When someone is upset or gloomy they are tired, week, weary because they don't want to do anything. So this line would help create gloomy tone of the poem.
U didnt provide alot of context but i would say that because he is calling the (what im assuming) child on having a somewhat fake sight but is happy about it. So go with the tone ig
