Margaret Wise Brown's Goodnight Moon https://en.wikipedia.org/wiki/Goodnight_Moon

( with bonus book ban credentials:

  From the time of its publication in 1947 until 1972, the book was "banned" by the New York Public Library due to the then-head children's librarian Anne Carroll Moore's hatred of the book.

  According to children's literature expert Betsy Bird, Moore criticized Goodnight Moon due to the fact that she believed it lacked a meaningful narrative structure and educational value.

)

That is a great book. All my kids loved it.

"Good night little house and good night mouse, good night comb and good night brush, good night nobody, good night mush"

My kids loved the mush part. I still remember it more than a decade after I last read the book for the bajillionth time, often more than once per night, to a kid that wouldn't go to sleep.