Unohana no sakeru kakine ni yadori seshi nenu ni akenu to odorokarekeri - Shui Wakashu(English Translation & Meaning)

卯の花の咲ける垣根に宿りせし
寝ぬに明けぬと驚かれけり

Roma-ji: Unohana no sakeru kakine ni yadori seshi nenu ni akenu to odorokarekeri
English Translation: By the hedge where bloomed
the white deutzia flowers,
lodging for the night,
I started, thinking it dawn
before I had even slept.
Meaning: Lodging by a hedge where the deutzia bloomed, I was startled, thinking dawn had come before I had even slept.
Commentary: Book Sixteen Miscellaneous Spring Poems 1072

Headnote: "For a screen painting"
The poet says that when he lodged by a hedge where deutzia bloomed, he started, thinking dawn had come before he had even slept. The headnote shows it was written for a screen painting. Depicting the brightness of deutzia blooming white even at night as a startling mistake for the light of dawn, it impresses the flowers' whiteness on the reader. It shares the deutzia hedge with the preceding poem, 1071.
The author, Minamoto no Shigeyuki, was a son of Minamoto no Kanenobu and was adopted by his uncle Minamoto no Kanetada. He served as Provisional Governor of Sagami among other posts and died in Michinoku. He is counted among the Thirty-Six Immortal Poets and is known for his poem "kaze o itami" in the Hyakunin Isshu.

First line, "unohana no," means "of the deutzia," the same line as the third line of the preceding poem, 1071.
Second line, "sakeru kakine ni," means "by the hedge in bloom," sharing "kakine" with the second line of the preceding poem, "kayou kakine no."
Third line, "yadori seshi," means "where I lodged," with "shi" the attributive form of the past auxiliary "ki."
Fourth line, "nenu ni akenu to," means "that dawn had come before I slept," with the "nu" of "nenu" negative and the "nu" of "akenu" the perfective auxiliary, setting the same sound "nu" in contrast.
Final line, "odorokarekeri," means "I was startled," with "re" the continuative of the spontaneous auxiliary "ru" and "keri" exclamatory.
Author: Minamoto no Shigeyuki
Source: Shui Wakashu
Prev Poem: Hototogisu kayou kakine no unohana no uki koto are ya kimi ga kimasanu
Next Poem: Toshi o hete miyamagakure no hototogisu kiku hito mo naki ne o nomi zo naku