Hitori nuru ware nite shirinu ikemizu ni tsugawanu oshi no omou kokoro o - Senzai Wakashu(English Translation & Meaning)

独り寝る我にて知りぬ池水に
つがはぬ鴛の思ふ心を

Roma-ji: Hitori nuru ware nite shirinu ikemizu ni tsugawanu oshi no omou kokoro o
English Translation: By sleeping alone,
through myself I've come to know
on the pond's water
the mandarin duck without a mate,
the heart with which it longs
Meaning: Sleeping alone, I have come to know through my own self the heart of the mandarin duck that has no mate upon the waters of the pond.
Commentary: Book Thirteen Love Poems III 787

Headnote: "Composed on the heart of love when hundred-poem sequences were presented in the reign of Emperor Horikawa"
Composed on the heart of love when hundred-poem sequences were presented in the reign of Emperor Horikawa; the sequences are the Horikawa Hundred-Poem Sequences. By myself sleeping alone, he says, I have come to know the heart of the mandarin duck on the pond that has no mate. Mandarin ducks were thought never to leave their mates, and from his own lonely sleep he imagines the loneliness of one duck without a partner, conveying the desolation of love's solitary nights.
The author, "Major Counselor Kinzane," is Fujiwara no Kinzane; the original writes the title with a variant character. The son of Provisional Major Counselor Fujiwara no Sanesue, he was a maternal uncle of Emperor Horikawa and rose to Provisional Major Counselor.
The three poems from this one to 789 are all love poems from the Horikawa sequences.

First line, "hitori nuru": "sleeping alone," unable to sleep with the one he loves.
Second line, "ware nite shirinu": "nite" marks the means, "through myself who sleep alone," and "nu" is perfective, "I have come to know." The poem pauses here and stands in inverted order with the lower half.
Third line, "ikemizu ni": "on the water of the pond," where the duck is.
Fourth line, "tsugawanu oshi no": "tsugau" is to be paired, so "of the mandarin duck without a mate." Mandarin ducks were held to be devoted pairs.
Fifth line, "omou kokoro o": "the heart that the duck feels," the object of "shirinu" in the second line.
Author: Fujiwara no Kinzane
Source: Senzai Wakashu
Prev Poem: Shitahimo wa hito no kouru ni toku nareba ta ga tsuraki ni ka musubooruran
Next Poem: Koi o nomi shizu no odamaki kurushiki wa awade toshi furu omoi narikeri