Here, the speaker watches over a sleeping hand, most likely a lover's, though the poem never says so outright. The title plays on two meanings: "digital" as in fingers (digits), and perhaps the quiet, almost counted-out way the poem moves through them. Each finger has its own sleep, and the poem treats them like small, separate creatures. A couple twitch, as if dreaming, while the thumb stays heavy and still, like an anchor.
Then the imagery turns to plants. By morning, the fingers that dreamed will "blossom," and the others will "leaf out," so waking becomes a kind of spring. The speaker, who has kept the hand warm, imagines rising like rain and taking root in the other person's breath, which feels both soft and "sea-worthy," like something that could carry a boat.
The mood is tender, drowsy and quietly playful. The speaker seems content, even a little amazed, to be so close to someone asleep.