classic waka stream

さ寝る夜は多くあれども物思はず
安く寝る夜はさねなきものを
Roma-ji

Sanuru yo wa ōku aredomo mono mowazu yasuku nuru yo wa sane naki mono o

English Translation
The nights I lie down
to sleep are many, and yet
without heavy thoughts
a night of peaceful sleep
there has never been
Meaning
Many are the nights I lie down to sleep, yet there is never one night when I can sleep in peace, free of brooding.
Commentary
Book Fifteen Exchange Poems of Nakatomi no Yakamori and Sano no Otogami no Otome 3760

Headnote continued from the preceding poem: "Poems exchanged between Nakatomi no Ason Yakamori and Sano no Otogami no Otome"
He sings that though the nights he lies down to sleep are many, there is never a night he can sleep peacefully without brooding. Taking up "nuru yo shi zo ōki" from the preceding poem, he adds that though nights pile up, not one brings restful sleep. Contrasting "sanuru yo" with "yasuku nuru yo," he stresses the pain of sleepless nights.
The author, Nakatomi no Yakamori, was a son of Nakatomi no Azumahito, from the Nakatomi clan in charge of the rites of the gods. He was exiled to Echizen Province for an offense, but was later pardoned and returned to the capital.
A left note reads "the above thirteen poems are by Nakatomi no Ason Yakamori"; the thirteen poems from 3754 to 3766 of this book were sent by Yakamori to the young woman from his place of exile. The latter half of this book contains sixty-three poems exchanged between Nakatomi no Yakamori and Sano no Otogami no Otome. According to the book's table of contents, when Yakamori took as his wife the young woman, a lady-in-waiting of the palace storehouse office, he was exiled to Echizen Province by imperial decree. The place of exile is thought to be Ajimano in Echizen, near present-day Echizen City, Fukui Prefecture.

First line, "sanuru yo wa": "sa" is a prefix: the nights I sleep. It takes up the last line of the preceding poem, 3759.
Second line, "ōku aredomo": though there are many, turning with an adversative.
Third line, "mono mowazu": without brooding.
Fourth line, "yasuku nuru yo wa": a night of peaceful sleep, paired with "sanuru yo" in the first line.
Fifth line, "sane naki mono o": "sane" with a negative means never, and "mono o" is an exclamation with an adversative turn: there is never one, the poem ends.
Author
Nakatomi no Yakamori
Source
Manyoshu
Prev Poem
Tachikaeri nakedomo are wa shirushi nami omoiwaburete nuru yo shi zo ōki
Next Poem
Yo no naka no tsune no kotowari kaku sama ni narikinikerashi sueshi tane kara