Everyone falls asleep every night, yet almost nobody can describe the moment it happens, because it always slips away just as we reach for it. "Somnium", which is Latin for "dream", tries to catch that slipping. It follows one speaker from the click of the light switch to the point where sleep finally takes over. Its central idea is that sleep is a surrender: the racing, questioning mind has to be let go before rest can arrive.
The shape of the poem does much of the work. It is built from sixteen two-line stanzas, but the rhyme only clicks when you read them in pairs. "Head" in the first stanza is answered by "bed" in the second, "race" by "space", "rest" by "chest". Each pair is really a ballad-style quatrain, rhyming on its second and fourth lines, then cut in half by white space. Those gaps work like the pauses between slowing breaths, or eyelids drooping and lifting again. The lines are short, with two or three strong beats each, so the rhythm rocks steadily like a lullaby. A poem about drifting off that lurched and jangled would contradict itself, and this one lulls the reader along with the speaker.
Repetition deepens the effect. Four times a phrase is doubled: "To sleep, to sleep", "A dream, a dream", "In time, in time", "I sleep, I sleep". They return like a murmured refrain. The grammar also shifts. The first is an infinitive and a duty ("I must go at last"), while the last is a plain present-tense fact. The speaker moves from needing to sleep to simply sleeping, with no heroic effort in between.
The struggle sits in the middle. For the first four stanzas the speaker cooperates: eyes flutter, light goes off, head goes down. Then comes "Yet I do not go." The couplet "My body's on earth, / My thoughts are in space" is the poem's sharpest image, with the body pinned to the mattress while the mind drifts off the planet. The thoughts themselves are not specific. They are the big, unanswerable questions that tend to turn up at night: "my purpose / And who I'll be." The poem doesn't answer them. The next stanza says only "A dream, a dream / Is all I see," and the questions melt into imagery. The suggestion is that some worries can't be solved after dark, only slept through.
After that, attention moves from mind to body. Earlier the poem keeps listing parts of the speaker (eyes, head, mind, thoughts), and now the body takes charge: "Safe under the sheets / My heart's at rest." "My breathing's heavy / Lifting my chest" lets you almost feel the slow rise and fall. The word "safe" matters, because sleep needs trust. Then the room dissolves: "The walls fade." Even the rhyme loosens here. "Closed" and "pose" are only a near-match, which may be deliberate, as though the poem too is going slack. "Nightly pose" is a nice touch, since it makes the curled-up position a ritual the body has performed countless times.
The ending is circular. "Last" and "passed" rhyme in the third and fourth stanzas, when the hour is already late ("The time to wake / Has long since been passed"), and they return in reverse at the close: "What time has passed... I sleep at last." The words are the same, but the mood has flipped. Time, once a pressure, now "matters not." In between, the speaker makes the poem's only confident prediction: "I won't notice / As my dreams will thrive." The speaker foretells their own unconsciousness, and the poem has to stop there, because nobody can narrate the moment they stop noticing. The last line is the final thing the speaker is awake to say.
What makes the poem worth reading is that it never reaches for drama. It takes the most ordinary ritual of the day and treats it as a small act of faith: letting go of time, of purpose, of control. The title promises a dream, yet no dream is ever described. The poem stays at the threshold, the part of the night we almost never remember, and its plain, repetitive, soothing form behaves exactly like the thing it describes.