Shelley’s speaker calls out to Night like a desperate lover, begging her to come quickly. He imagines her sweeping in from the western sea, leaving the lonely cave where she spins dreams all day — dreams that make her both terrifying and dear. He adores her mystery and longs for her to shroud the sun, to scatter starlight through her grey cloak and gently wear out the daylight by kissing its eyes shut. Then he wants her to drift everywhere, touching the world with a drowsy, magical wand.
Daytime itself feels like a tedious wait: he sighs for her from dawn until the weary afternoon slinks off like an unwanted guest. When Night’s own relatives — Death and Sleep — each offer to come instead, he refuses them outright. Only Night will do. The poem creates an intimate, almost feverish mood, full of yearning for a darkness that promises refuge and a strange, soothing thrill.