Lines 1-2:

The opening lines identify the speaker as someone who feels tired and weak but is still awake in the middle of a gloomy night. He passes the time by reading a strange book of ancient knowledge. The first line of the poem contains alliteration of w in "while," "weak," and "weary" to produce the effect of unsteadiness. This line also sets the poem's rhythmical pattern and provides the first example of the use of internal rhyme in "dreary" and "weary."

Lines 3-6:

The speaker tells of becoming more tired and beginning to doze but being wakened by a sound that he assumes is a quiet knock. Internal rhymes of "napping," "tapping," and "rapping" along with repetition of these last two words, create a musical effect. This effect is also produced by alliteration of n. These sound devices and the steady rhythm of these lines are almost...