Hiding a heart sounds like a safe plan until something starts to sing. That is the small drama at the centre of Swinburne's ballad. The speaker tucks his heart into a nest of roses, out of the sun, in a bed "softer than the soft white snow's", and the heart still will not settle. Nothing outside has moved, since "never a leaf of the rose-tree stirred", yet sleep takes fright and flutters away. The cause is "the song of a secret bird", a line that closes every stanza and never explains itself.
The poem's central idea is the wish to be released from feeling, and the doubt about whether that is possible. In the second stanza the speaker coaxes his heart like a child ("Lie still") and then questions it like a suspect. Does a thought "smart" like a thorn's wound? Does "the fang" of "hope deferred" still fret it? The thorn is a quiet joke at the roses' expense, because the refuge carries its own pain. Judging by these questions, the trouble is inside the heart, and the bird may be its own longing made audible. The poem never says so, and that withholding is part of its charm.
The third stanza moves from the heart's trouble to the place it hopes to reach. Dreamland is described mostly by what it is not. It was "never writ in the traveller's chart" and "never sold in the merchant's mart", so it lies beyond both travel and trade, and effort cannot get you there. Then the images soften: "swallows of dreams" dart through "dim fields", and the tree-tops carry "sleep's" tunes. The line "No hound's note wakens the wildwood hart" is the most telling. A hart is a deer, and the word sounds exactly like the "heart" hidden in the first stanza. It is hard not to hear the echo: the hunted creature is finally somewhere no one hunts.
The form works like a lullaby. Each eight-line stanza rhymes ABABBCBC, and the B-rhyme is the same "-art" sound four times over: "apart", "heart", "start", "part". The refrain's "-ird" sound ("stirred", "deferred", "heard", "bird") then gives each stanza a gentle landing. The lines have four beats with extra unstressed syllables, so they rock rather than march. Swinburne also shapes the texture of the sounds. Soft, hushing consonants dominate where the speaker wants calm ("mild leaves muffle", "soft white snow's"), and harder ones cut in where pain is mentioned ("keen sun's dart", "thorn's wound smart"). The rhymes sometimes bend grammar to fit, as in "roses" and "snow's is", or "grows is" in the third stanza. The effect is that sound seems to lead and sense follows, which suits a poem about drifting into sleep.
The short envoi, half the length of a stanza, changes the tone. For the first time the speaker names a decision: "I have chosen my part." He will "sleep for a season", a phrase that makes the retreat temporary, and he will hear "no word / Of true love's truth or of light love's art". Both serious love and playful love are refused. Yet the last line gives him one exception. He wants silence, but he keeps the bird. This is the poem's neatest irony, because the only sound he permits is also the poem's own music, the refrain that has been singing through every stanza.
That is why the poem is worth reading closely. It shows Swinburne, a Victorian poet known for musical verse, using repetition and rhyme to do more than decorate. The refrain enacts the idea: a feeling you try to bury returns in the form of a tune. Whether dreamland is a healing rest or an evasion is left open. The speaker has chosen it, but he cannot quite shut out the song that follows him there.