The "night" is obviously death, but the question is more why it is described as "good".
Dylan Thomas could easily have used a negative adjective such as "dread" or a neutral one such as "dark" to make the poem scan. Instead, he chooses a simple, positive adjective to set up opposing views within the poem. He does not want his father to die, or even to ...
This is hinted at in a few places in the poem, in particular "rage, rage against the dying of the light," and "Grave men, near death" in the second-to-last stanza, as well as "Though wise men at their end know dark is right."
But the real proof is found here. The first line of the article is:
Thomas' poem for his dying father, exploring the ...
Byron’s use of “nor” is sense 2b in the Oxford English Dictionary, where the examples make it clear that “neither” is indicated. Note the 1813 quotation showing that Byron was familiar with this sense.
nor, conj. 2. Without immediately preceding (negative) correlative (such as neither).
b. Without other negative expressed. Now rare.
1594 C. Marlowe & ...
Interpretation on Reading
It seems to me, on reading the work, but not any analysis others have done of it, that the "you" of the poem is a personified voice of the oceans, all the seas of the world. There is an extended set of comparisons of "your" formerly living and marine state, with its current dry and dead situation.
One of the meanings of “furnace” is:
furnace, n. 3. A closed fireplace for heating a building by means of hot-air or hot-water pipes
Oxford English Dictionary.
(This apparatus is more commonly known as a “boiler”.)
So Hughes’ image is of intestines being packed in the abdomen like hot water pipes in a boiler.
I think the most plausible way to make sense of ...
We know that the "good night" represents death. I explained this in a previous answer where I showed that the poem was written for his dying father. So the addressee of
And you, my father, there on the sad height,
is dying. The speaker is imploring the father not to die, and the father is on the verge of death. This is what I always took "sad height"...