Poetry and Rhymes

What does the title refer to in "Do Not Go Gentle Into That Good Night"?

More Questions from Poetry and Rhymes
In 'Jack be Nimble', what did Jack jump over?
Reveal Answer
In a fairy tale by Oscar Wilde, what bird wants to date a professor's daughter?
Reveal Answer
Who introduced the poetic form of a Dramatic Monologue to literature?
Reveal Answer
When the three little kittens found their lost mittens, what did their mother give them?
Reveal Answer
Who marched his men up to the top of the hill, then marched them down again?
Reveal Answer
In "The Wild Swans", a brave princess rescues how many brothers from a terrible spell?
Reveal Answer
What line of poetry follows the famous line "I think that I shall never see"?
Reveal Answer
Who were the mice chasing, in the song "Three Blind Mice"?
Reveal Answer