Yo to tomo ni nuru to wa sode o omou mi mo nodoka ni yume o miru yoi zo naki - Izumi Shikibu Nikki(English Translation & Meaning)

よと共にぬるとは袖を思ふみも
のとかに夢を見る宵そなき

Roma-ji: Yo to tomo ni nuru to wa sode o omou mi mo nodoka ni yume o miru yoi zo naki
English Translation: For one who believes
her sleeves are ever wet with tears
through each passing night,
there is never a tranquil night
for seeing peaceful dreams
Meaning: For one who feels her sleeves are always wet with tears, there is never a quiet night for peaceful dreams.
Commentary: 3 The First Night Together

On receiving her reply, the prince unexpectedly resolved to visit her in secret and made ready from midday. He summoned the man of the Right Palace Guards who usually carried his letters and told him they were going out; the man understood and attended him. The prince came in a humble carriage and had his arrival announced. Izumi Shikibu felt it was most awkward, but she could not claim to be away, and having answered him that very afternoon, she thought it unkind to send him back, so, meaning only to talk, she set out a round cushion at the west double door and let him in. The prince was every bit as graceful as people said. As they talked, the moon rose and grew very bright. "Being an old-fashioned, retiring sort," he said, "I am not used to sitting so near the edge, and I feel exposed. Let me sit where you are. I will not behave like the men you have known." She answered lightly, "How strange. I meant only to talk with you tonight. What men I have known?" Meanwhile the night grew steadily later.
The woman is Izumi Shikibu, daughter of Ōe no Masamune and, as the wife of Tachibana no Michisada, Governor of Izumi, mother of Koshikibu no Naishi. The prince is Prince Atsumichi, fourth son of Emperor Reizei. The man of the Right Palace Guards was the prince's close attendant who carried his letters and accompanied him on his outings; the title refers to a third-rank officer of the Right Inner Palace Guards.
When the prince offered "Haka mo naki yume o dani mide akashite wa nani o ka natsu no yogatari ni semu," Izumi Shikibu answered with this poem, adding, "and tonight least of all."
The prince said that he was not one to go about on frivolous secret visits, and that even if she thought him heartless, he felt something close to fear, so strongly was he drawn. Then he quietly slipped inside. She felt helpless, but it was useless to protest; they exchanged many words of promise, and at dawn the prince went home.

The opening lines mean "my sleeves, which I think are always wet," where "yo" carries both "world" and "night," and "nuru" means both "to be wet" with tears and "to sleep," shifting his wish to lie together onto sleeves soaked with tears.
The remaining lines say that for one who feels this way there is no night to dream in peace, sealed by an emphatic construction. Taking up his "dream," she retorts that one weeping for the late prince has no leisure for dreams, and with her added "tonight least of all" she deftly parries his request.
Author: Izumi Shikibu
Source: Izumi Shikibu Nikki
Prev Poem: Haka mo naki yume o dani mide akashite wa nani o ka natsu no yogatari ni semu
Next Poem: Koi to ieba yo no tsune no to ya omouran kesa no kokoro wa tagui dani nashi